Section 2. the Opening of the Game

The opening of a game in draughts is not as important as in chess. In chess you need to know many theoretical lines to be able to play at top level. In draughts one has more freedom to choose what to play. Still, it is necessary to have some knowledge of popular openings. It will save you a lot of time if you know how the opening works already. The goals of opening play are:  Getting an interesting game  Getting a type of game that you’re good at  Getting a line of which you have knowledge

We aren’t interested in changing pieces, of course. Therefore we will only address the sharp lines openings offer. This section will give you an overview of popular openings, but there is lots more to learn about openings. If you want to know more, you can study games yourself or visit the website of Frits Luteijn at http://home.kpn.nl/dammen/. There is a lot of theory about openings at his site. You can try the Google translator to read the Dutch text.

The opening of the game Index of openings

1.32 – 28 opening Introduction 1) 1… 19 – 23 Symmetrical variation How to play the opening depends on what type 1.1) The main line of game you prefer to play. Some people like 1.2) Roozenburg variation to play classical games and their opening play 1.3) Drost sacrifice will be aimed at getting a good classical 1.4) Wiermsa counter sacrifice position. Other people like modern play and 1.5) Springer counter attack their openings will have the directive of getting 1.6) System with 7.40 – 35 attractive modern play. And of course players 1.7) Groninger variation who like locking positions will play trying to get 1.8) Chizhov-exchange such positions. An example will make this more concrete. 2) 1… 18 – 23 Chefneux opening 2.1) The Fox (2.33 – 29 23 x 32 3.37 x 28 20 – Let’s assume white plays 1.34 – 29 25) If black wants a classical game he can choose 2.2) Modern variation (3… 17 – 22 x 22) 1…. 20 – 24 2.29 x 20 15 x 24 3.32 – 28 10 – 2.3) The Highlander (2.38 – 32) 15. 3) 1… 17 – 22 2.28 x 17 11 x 22 Chogoliev He can also delay making classics and try opening something like 1… 19 – 23 2.40 – 34 14 – 19 3.1) Korchov opening 3.45 – 40 10 – 14 4.32 – 28 23 x 32 5.37 x 28 3.2) The Chizhov attack 5 – 10 6.42 – 37 17 – 22 7.28 x 17 12 x 21 8.37 – 32 20 – 24 9.29 x 20 15 x 24. 4) 1… 17 – 22 2.28 x 17 12 x 21 Schwarzman manoevering opening Black takes <24> and the game becomes 4.1) The right wing variation (3.35 – 30) classical. Later the game may become closed 4.2) The wasp (3.31 – 26 7 – 12 4.26 x 17 12 x classical. 21) 4.3) Prosman-attack (4... 11 x 22) If black wants a modern game, he can choose 4.4) Main line (3.37 – 32) 1… 17 – 22 2.40 – 34 11 – 17. 4.5) Surrounding variation (3.34 – 30)

If black wants a fork lock he can try 1… 20 – 5) 1... 18 – 22 The eagle 25 2.40 – 34 14 – 20 3.45 – 40 10 – 14 5.1) Mutual outpost variation (5.34 – 30 20 – The immediate 19 – 24 is here possible, but 25) played rarely. 5.2) The black rush (5.34 – 30 20 – 25) 5.3) Roozenburg variation (5.31 – 26 19 – 23) 4.32 – 28 17 – 21 5.31 – 26 19 – 24 6.26 x 17 5.4) Fork Lock variation (5.31 – 26 20 – 25) 11 x 22 7.28 x 17 12 x 21 6) The black panther 1... 16 – 21 And from this position many interesting games 6.1) Right wing lock variation (2.31 – 26 11 – have been played such as Georgiev – 16) Sijbrands (1999), that was covered in part 2 of 6.2) Russian variation (3.38 – 32) this course. 6.3) Dutch variation (3.37 – 32) 6.4) Andreiko variation (2... 18 – 22) There are many ways to play an opening.

Isidore Weiss once said that every opening is 7) The hedgehog (1... 17 – 21) good, if continued correctly… 7.1) Schwarzman variation (5.38 – 32)

8) The Russian bear (1... 20 – 25)

9) The cow (1... 20 – 24) An overview of popular openings 1) The cow (2.34 – 30 14 – 20) 2) Semi classical variation (2... 18 – 23) The most frequently played move to open the game is 1.32 – 28 which gives white the 1.33 – 29 The diamond opportunity to develop his left wing immediately. 1) Roozenburg opening (1... 19 – 23 2.35 – 30 The 1.32 – 28 opening 20 – 25) 2) Keller opening (1... 17 – 22) Symmetrical variation 3) The hedgehog (1... 17 – 21) 4) Krajenbrink attack (1... 16 – 21) For the same reason black’s most frequently 5) Classical reply (1... 20 – 24) played answer is 6) The buffalo (1... 18 – 22 2.31 – 26 20 – 24) 1… 19 – 23 2.28 x 19 14 x 23 1.33 – 28 Sijbrands opening White’s most simple, but sound strategy is to change 1) Old Dutch (1... 18 – 23) 2) Modern play (1... 18 – 22) 3.33 – 28 23 x 32 4.37 x 28 3) The seagull (1... 17 – 21) and both players can develop their positions easily, for example: 1.34 – 29 Fork lock opening

4… 10 – 14 5.39 – 33 5 – 10 1) Chizhov opening (1... 19 – 23 ... 5.29 – 24) 6.44 – 39 14 – 19 7.41 – 37 2) Fork lock variation 1 (5.31 – 26) 3) Fork lock variation 2 (1... 20 – 25) 4) The peacock (1... 17 – 22)

1.34 – 30 French opening

1. The cheetah (1... 20 – 25 2.30 – 24) 2. Ottink variation (1... 17 – 22)

1.31 – 27 Polish opening

1) Semi-classical opening (1... 19 – 23 2.33 – 28 17 – 21) Now black has to make up his mind what plan 2) Left wing opening (1 ... 17 – 21 2.27 – 31) to follow. If he wanted a classical game he 3) The big leap (1... 17 – 22 2.36 – 31 22 – 28) could have played 6… 20 – 24 already.

1.31 – 26 The edge opening If black wants a quiet maneuvering game 7… 10 – 14 8.46 – 41 17 – 22 9.28 x 17 12 x 21

can be chosen. 1. The edge opening (1... 19 – 23) 2. The rejected edge opening (1... 17 – 21 2.26 If black wants a modern play with a possible x 17 11 x 22) Roozenburg-attack he can play here or at the next move 7… 16 – 21, for example: 1.35 – 30 The wild horse 7… 16 – 21 8.31 – 26 18 – 22 1) The wild horse (1.35 – 30 20 – 25) 9.37 – 32 11 – 16 10.46 – 41 9 – 14 11.41 – 37 3 – 9

White often goes to <23> in such situations playing 12.28 – 23 19 x 28 13.32 x 23.

At 12.34 – 29 black plays 20 – 24 x 24 and later 21 – 27 x 27 getting a Roozenburg attack.

The main line

Usually 1.32 – 28 19 – 23 2.28 x 19 14 x 23 is answered by:

3.37 – 32 10 – 14

There are several ways to play for white depending on what his preferences are. Things are different if white plays 9.45 – 40?! If white wants to play a sharp modern game he (instead of 9.31 – 27) 14 – 20 10.30 – 24? 19 x can play 4.35 – 30 or 4.41 – 37 5 – 10 5.35 – 30 11.35 x 24 for now 25 – 30! 12.34 x 14 23 x 30 hoping for a Roozenburg attack after 20 – 45 13.14 – 10 9 – 14! 14.10 x 19 22 – 28 15.32 25 33 – 29. Usually white plays x 23 18 x 20 wins a piece for black.

4.41 – 37 5 – 10 5.46 – 41 14 – 19 From the last diagram white usually plays Only then he decides how to continue. He can 14.38 – 33 17 – 21 15.42 – 38 21 – 26 also play the popular 5.35 – 30 or 5.34 – 29 16.41 – 36 23 x 34 6.39 x 30. Avoiding the king shot 16 – 21 26 – 31 13 – 19 17 x 46.

16… 11 – 17 17.48 – 42 1 – 6

Roozenburg – variation

The most popular move is 6.35 – 30 and after

20 – 25 both 7.33 – 29 and 7.40 – 35 are played. If white wants a Roozenburg attack he If black plays 4 – 10 or 17 – 21 the normal should choose 7.33 – 29, for example 18.50 – 45 is fine, for example 17… 4 – 10 18.50 – 45 17 – 21 19.33 – 28 1 – 6 20.28 x 19 7.33 – 29 10 – 14 8.40 – 35 17 – 22 18 – 22 21.27 x 18 12 x 14 with a right wing 9.31 – 27 22 x 31 10.36 x 27 11 – 17 attack for white. In the second part of A Course 11.45 – 40 6 – 11 12.30 – 24 19 x 30 in draughts the game Sijbrands – Gantwarg 13.35 x 24 14 – 20 (1973) from this opening was shown. This Roozenburg position has emerged in But in this case black plays 17… 1 – 6! white many games. White doesn’t have to fear 25 – should play 18.40 – 35! 30 for after 34 x 14 23 x 45 14 – 10 white wins. The reason is that 18.50 – 45 6 – 11 19.33 –

28 4 – 10 20.28 x 19 9 – 14 21.38 – 33 14 x 23 22.33 – 28 26 – 31 23.37 x 26 13 – 19 24.24 x 22 3 – 9 25.29 x 18 12 x 23 26.28 x 19 17 x 48 27.36 – 31 11 – 17 28.19 – 14

10 x 19 29.47 – 42 48 x 37 30.31 x 42 7 – Of course there are many more variations, but 12 31.42 – 38 9 – 13 is not so pleasant for these sharp lines will give you an idea of what white, he can only hope for a draw. can happen in this Roozenburg system.

th Playing 22.36 – 31 10 – 14! makes things only At the 8 move the Springer Contra Attack 8… 23 – 28 9.32 x 23 19 x 28 is also a popular worse. 23.33 – 28? Is punished by 14 – 19 continuation. 24.40 – 35 19 x 30 25.35 x 24 17 – 22! 26.28 x 6 23 – 28 27.32 x 23 7 – 11 28.6 x 17 12 x 41 Drost-variation etc. B+. From the diagram starting the Roozenburg- The famous Wiersma – Kuyken (1973) game variation, black can choose to play against the showed that also after 23.43 – 38 14 – 19 Roozenburg-attack, playing the Drost gambit. 24.40 – 35 19 x 30 25.35 x 24 17 – 21 26.33 – 28 12 – 17 27.28 x 19 18 – 23 28.29 x 9 20 x 6.35 – 30 20 – 25 7.33 – 29 17 – 22

40 29.45 x 34 3 x 23 black has a good game, Black doesn’t play 10 – 14 but keeps his piece since white’s left wing is locked (see game in at <10> not going to <20> because this is appendix) better for playing the Drost-gambit.

19.40 – 35! 6 – 11 20.33 – 28 8.40 – 35 11 – 17 9.31 – 27 22 x 31 10.36 x 27 6 – 11 11.45 – 40 17 – 21 12.38 – 33 21 – 26 13.43 – 38 11 – 17 14.30 – 24 19 x 30 15.35 x 24 17 – 21 16.41 – 37 12 – 17

If white played 50 – 45 (instead of 40 – 35) black would be able to play 26 – 31 now. But in this case (with 19.40 – 35! played) 20… 26 – 31 isn’t good. Black has to take the 4 – 10 temp giving white a counter-shot: 21.37 x 26 The key position can be reached with all kinds 13 – 19 22.24 x 22 4 – 10 23.28 x 19 17 x 48 of different move orders. Black doesn’t want to 24.19 – 14 10 x 19 25.29 – 24 20 x 40 26.39 – answer 17.33 – 28 by a counter-attack at the 34 48 x 30 27.35 x 4 W+. piece at <27>.

20… 4 – 10 17.33 – 28 7 – 12 18.28 x 19 17 – 22 21.28 x 19 9 – 14 22.36 – 31 14 x 23

The orthodox defense for white goes 19.39 – White can play either 23.38 – 33 with a very 33 22 x 31 20.36 x 27 12 – 17 21.47 – 41 2 – 7 sharp game or: 22.44 – 39 17 – 22 23.41 – 37 22 x 31 24.26 x

27 7 – 11. 23.27 – 22 18 x 36 24.29 x 9 20 x 40 White can never play 33 – 28 because of 15 – 25.9 – 4 20 B+. This is the reason black didn’t go to

<20>! In Sijbrands – Gantwarg (1990) then followed Here or later white gives back the piece 19 – 25.4 – 27 11 – 16 26.50 – 45 3 – 9 27.27 x 4 14 10 x 30 29 – 23 18 x 29 33 x 35 =. If white 21 – 27 28.32 x 21 16 x 27 29.45 x 34 10 - plays this immediately black is better after 1 – 14 30.4 x 31 36 x 27 31.34 – 29 8 – 13 6! 39 – 33 13 – 18 for white has to take care 32.39 – 34 12 – 18 33.29 – 24 17 – 22 34.44 for 26 – 31 all the time. If he plays 33 – 28 – 39 13 – 19 with a draw. black goes 26 – 31 37 x 17 11 x 31 and the

piece at <31> can’t be changed.

Black has to do something against the 33 – 28 The sharpest defense is called the Wiersma 30 x 10 threat. He doesn’t want to play 14 – 20 counter-sacrifice: or 14 – 19 because he wants to play against white’s right wing. Playing 14 – 20 gives white Wiersma counter sacrifice the possibility to develop his right wing playing 42 – 38 45 – 40 50 – 45 (and possibly 49 – 44 19.40 – 35! 22 x 31 20.26 x 27 12 – 17 – 39) and 29 – 24 x 23 x 29, while after 14 – 19 21.27 – 22! 18 x 27 22.29 – 23 white can change to <24> later, developing piece 35. In the Traoré – Gantwarg (1980) If white keeps his piece at <19> usually it is game in the appendix black showed a nice good for black. The idea for white is to play 39 surrounding strategy. The opening was slightly – 33 and change back 34 – 30 24 – 20 keeping different, black not taking the counter attack a sound center attack. until 9… 17 – 22 10.31 – 27 22 x 31 11.36 x 27 was played. 22… 17 – 22 23.39 – 33 27 – 31 Black can also play the Springer Counter Threatening 22 – 28 21 – 27. Attack differently.

24.32 – 28 31 – 36 6.35 – 30 20 – 25 7.33 – 29 9 – 14 8.40 – 35 3 – 9 9.45 – 40 23 – 28 24… 13 – 18 25.23 x 12 8 x 17 (See Wiersma 10.32 x 23 19 x 28 – Georgiev (1995) in the appendix) and 24… 9 – 14 25.28 x 17 21 x 12 26.23 – 18 12 x 23 27.19 x 28 are also played.

25.28 x 17 21 x 12 26.34 – 30 25 x 34 27.24 – 20 15 x 24 28.19 x 39

The position, white having a centre attack, black having his defensive zone intact, is about equal.

Springer Counter Attack

From the diagram with the Roozenburg attack black can also play White can choose from 11.39 – 33 28 x 39 12.44 x 33, 11.38 – 33 and 11.30 – 24. 6.35 – 30 20 – 25 7.33 – 29 10 – 14 8.46 – 41 23 – 28 9.32 x 23 19 x 28 11.50 – 45? can be met by 16 – 21! 12.31 – 26 21 – 27 13.30 – 24 13.37 – 31? 28 – 33 & 17 – 21 B+1. 13.38 – 33 27 – 32 14.33 x 22 18 x 27 15.37 x 28 17 – 21 B+ 1. 13.38 – 32 27 x 38 14.43 x 23 13 – 19 gives black an advantage. 13… 28 – 33! 14.39 x 28 14 – 19 15.43 – 39 19 x 30 16.35 x 24 27 – 31 17.36 x 27 15 – 20 18.24 x 15 25 – 30 19.34 x 25 17 – 22 20.28 x 17 12 x 23 with a better position for black.

System with 7.40 – 35

If white plays (6.35 – 30 20 – 25) 7.40 – 35 a 10.45 – 40? is too slow. Black gets an different kind of game evolves. advantage by 10… 16 – 21! 11.31 – 26 17 – 22 The sharp line 8… 15 – 20 9.44 – 40 20 – 24 12.26 x 17 12 x 21 10.50 – 44 17 – 21 11.31 – 26 21 – 27 12.32 x 21 16 x 27 13.33 – 28 23 x 32 14.37 x 28 11 – 10.31 – 27 17 – 21 11.37 – 31 21 x 32 17 15.28 – 23 19 x 28 16.30 x 19 13 x 24 12.38 x 27 18 – 22 13.27 x 18 13 x 22 17.34 – 30 25 x 34 18.40 x 20 will give an 14.39 – 33 28 x 39 15.44 x 33 4 – 10! exciting fight in which white has to play against

69 black’s attacking position with outposts at <27 & 28>. 5.34 – 29 23 x 34 6.39 x 30

10… 10 – 14 is met by 11.34 – 29 23 x 34 Chizhov popularized this continuation and got 12.40 x 20 25 x 34 13.39 x 30 14 x 34 and many followers. If black wants a classical white can choose from 14.44 – 39 winning game he can opt for 6… 20 – 24 7.30 x 19 13 x back te piece immediately but allowing 16 – 21 24. Most of the times black plays – 26, or if white doesn’t want to allow this, he can first play 14.31 – 27?! or 15.32 – 27(!) and 6… 14 – 19 7.44 – 39 10 – 14 8.40 – 34 then win the piece back.

A more quiet approach is:

Groninger variation

This line is named after the capital city of the Dutch province Groningen, with the same name. In the 1970’s and 80’s draughts was very popular and this line was explored by strong players from Groningen.

6.32 – 28 23 x 32 7.37 x 28 giving black the initiative. Now black can After 20 – 25 white attacks 30 – 24 19 x 30 35 consider launching a Roozenburg attack: x 24. The most frequently played move is 8… 18 – 23 but also 17 – 22 and 16 – 21 are 7 … 16 – 21 8.31 – 26 18 – 22 9.42 – 37 popular continuations.

8… 18 – 23 9.45 – 40 12 – 18 10.46 – 41 7 – 12 11.32 – 28 23 x 32 12.37 x 28 1 – 7 13.50 – 45 17 – 22 14.28 x 17 11 x 22 15.30 – 25 16 – 21 16.31 – 26 21 – 27 17.41 – 37

17.34 – 30 can also be played like in Chizhov – Wesselink. We show the game in the appendix, because of the nice way in which Chizhov plays against edge piece <36> in the appendix.

If black plays the passive 13… 17 – 21 14.41 – Black has to take care not to fall victim to the 37 21 – 26 white can try to put pressure on the kingshot after 9… 11 – 16? 10.33 – 29 22 x 31 opponent by building the power block, see the 11.36 x 27 21 x 32 12.29 – 24 ad lib. 13.34 x 5 Chizhov – Berçot (2002) game in the appendix. W+. He should close the gap at <14> first.

9… 9 – 14 10.37 – 32 11 – 16 11.41 – 37 3 – 9 12.48 – 42 7 – 11

12... 6 – 11 is also played often, but 7 – 11 turns out to be best. White can launch the Springer Contra Attack again playing 28 – 23 x 23, but 20 – 24 gives black a good position. If white plays 13.34 – 29 20 – 24 14.29 x 20 15 x 24 15.40 – 34 21 – 27 16.32 x 21 16 x 27 black has got the desired Roozenburg attack.

The Chizhov-exchange This position has been played at least 40 times in registered games as the valuable draughts Instead of 5.46 – 41 white frequently plays 70 games database Turbo Dambase reveals. Most black players go to <36> playing 5.37 – 32

17… 27 – 31 18.36 x 27 22 x 31 White can attack immediately 5.29 – 24 20 x 29 6.35 x 24. This Fox is played frequently by with an exciting game. Black can also try to masters and grandmasters against weaker maintain his right wing attack, playing 17… 19 opponents to complicate the game and play – 23. against the right wing attack. Players like Baljakin, Schwarzman and Gantwarg love to The opening 1.32 – 28 19 – 23 is intensively play the Fox and have gained good results and covered in a book written by Baliakin and played several beautiful games with it. Gantwarg: 1.32 – 28 19 – 23 12 systems. The book – with English text - can be bought at 5… 16 – 21 the office of the Dutch draughts federation KNDB. The other important move is the ordinary 5… 7 [email protected] – 12. White has to make a choice:

The second most popular answer to 1.32 – 28 1) 6.29 – 24 19 x 30 7.35 x 24 with right wing is 18 – 23. Of course white can’t play 2.37 – 32 attack. because of the Harlem shot 23 – 29 B+2. The best replies are 2.33 – 29 and 2.38 – 32. 2) 6.39 – 33 19 – 23 7.28 x 19 14 x 23 and form many variations we show: The Fox 8.44 – 39 10 – 14 9.50 – 44 14 – 19 10.46 – 41 5 – 10 11.42 – 37 15 – 20 12.32 – 28 23 x 32 1.32 – 28 18 – 23 2.33 – 29 23 x 32 13.37 x 28 19 – 23 14.28 x 19 13 x 24 15.35 – 3.37 x 28 30 24 x 35 16.29 – 23 18 x 29 17.33 x 15 with an interesting play with the edge piece at If white plays 2.34 – 29 23 x 32 3.37 x 28 black <15>. can play 12 – 18, but after 2.33 – 29 the move is prohibited! 3) 6.46 – 41 1 – 7 7.41 – 37 17 – 21 8.39 – 33 Black can go in several directions depending 21 – 26 9.43 – 39! 11 – 17 on his desired strategy. If black wants a 9… 19 – 23 10.28 x 19 14 x 23 11.33 – 28 is modern game, playing against a right wing not so attractive for black. attack he can play the popular 20 – 25 entering 10.29 – 24! 19 x 30 11.35 x 24 with a good the Fox. This opening is called after Dutch right wing attack, in Sijbrands – Gantwarg draughts player J.H. Vos. Since ‘vos’ means (1995) followed 11… 7 – 11 12.31 – 27 17 – 21 fox in Dutch, we call this opening The Fox. 13.34 – 29 14 – 20 14.37 – 31 26 x 37 15.42 x 31 21 – 26 16.47 – 42 26 x 37 17.42 x 31 11 – 3… 20 – 25 4.41 – 37 12 – 18 17 18.40 – 34 17 – 22 19.28 x 17 12 x 21 20.45 – 40 21 – 26 21.33 – 28 26 x 37 22.32 x 4… 17 – 21 can give an exciting game 41 10 – 14 23.29 – 23 20 x 29 24.23 x 12 20 x especially if white allows black to create a fork 29 25.34 x 23 with a strong centre attack for lock without piece at <15>: 5.39 – 33 15 – 20 white.

1) 6.44 – 39 19 – 24 7.37 – 32 21 – 26 8.50 – 6.29 – 24 19 x 30 7.35 x 24 44 26 x 37 9.42 x 31 14 – 19 etc. wit exciting play, see Holstvoogd – Sijbrands in the If white doesn’t want to go to <24> so early, he appendix. can play 6.39 – 33 21 – 26 7.44 – 39 26 x 37 8.42 x 31 19 – 23 9.28 x 19 14 x 23. 2) 6.37 – 32 19 – 24 7.46 – 41 21 – 26 8.41 – 37 14 – 19 9.44 – 39 16 – 21 10.50 – 44 10 – 7… 11 – 16 14 11.31 – 27 11 – 16 and in this fascinating position 12.29 – 23! will result in an interesting 7… 21 – 26 8.39 – 33 26 x 37 9.42 x 31 7 – 12 fight. A fascinating variation is: 12… 7 – 11 9… 14 – 19 can be met by 10.44 – 39 19 x 30 Eliminating the 34 – 30 x 30 change by a and instead of 11.28 – 23 18 x 29 12.33 x 35 kingshot. with equality white can play 11.40 – 35 trying 13.34 – 29 5 – 10 14.40 – 34 12 – 17 15.27 – to keep his attack. 22! 8 – 12 16.23 – 18! 12 x 23 17.29 x 18 and 10.46 – 41 the outpost at <18> gives shape to an unorthodox game!

After 10.44 – 39 17 – 21 11.46 – 41? is If black wants a right wing attack he can try 6… punished by 13 – 19 24 x 22 21 – 27 32 x 21 9 – 13 7.41 – 37 16 – 21 8.31 – 26 21 – 27. 11 – 17 22 x 11 6 x 46 10… 17 – 21 11.41 – 37 21 – 26 12.47 – 42 with a sound attack for white. 7.35 – 30

8.46 – 41 7 – 12 9.41 – 37 1 – 7 The sharpest move. White can play 7.41 – 37 10.39 – 33 14 – 19 8.29 – 24 20 x 29 9.33 x 13 8 x 19 10.37 – 32 10 – 14 11.32 – 27 with a semi-fork. In this position black has tried all kind of However black’s strong centre compensates continuations. We show one variations in more than enough for this, as the G. Jansen – which white is trapped. Sijbrands game of 1988 proved. Sijbrands began to build his centre activating piece 2 with 2 – 8 – 13. See the section about strategy for this game.

7… 14 – 19

7… 20 – 25 is met by 8.30 – 24! 14 – 20 and to stop the plan 8 – 13 2 – 8 followed by an attack at <24> white plays 9.38 – 32! a move introduced by the author of this course. Many opponents (also pupils of mine) have become victim to the shot 8 – 13? 11.32 – 28! 23 x 32 12.34 – 30 25 x 23 13.41 – 37 20 x 38 14.37 x 28 W+1. 10… 21 – 26 11.44 – 39 If black plays 9 – 13 the outpost is safe and 11.43 – 39 can be played trying to get the white can transfer the position to a right wing position from Sijbrands – Gantwarg. attack or a Roozenburg attack. 11… 7 – 11 12.50 – 44 17 – 21 13.31 – 27 14 – 20 14.34 – 29?! 12 – 17 15.37 – 31? 26 x 37 8.40 – 35 8 – 13 9.41 – 37 16.42 x 31 Black can now play 16 – 21, but most of the White should play 15.28 – 23 but 8 – 12 16.33 time he goes on with 9… 6 – 11 after which – 28 9 – 14 17.39 – 33 3 – 8 18.37 – 31 26 x white can build the 46 / 41 / 37 tail in order to 37 19.42 x 31 17 – 21 20.48 – 42 21 – 26 change to <28>. If black plays 10 – 14 white 21.42 – 37 14 – 19 22.23 x 14 10 x 30 23.29 – can consider to play 30 – 25 blocking black’s 23 18 x 29 24.33 x 35 4 – 9! (threatening 16- left wing. 21) 25.27 – 22 * still leads to a better position for black. The Highlander

16… 18 – 23!! 17.28 x 19 21 – 26 and since 33 1.32 – 28 18 – 23 2.38 – 32 – 28 is punished by 26 x 37 32 x 41 25 – 30! B+ white is lost. is a more classical way to play for white. An important position is reached after After 1.32 – 28 18 – 23 2.33 – 29 23 x 32 3.37 x 28 black has more options of course. 2… 12 – 18 3.31 – 27 7 – 12 If he wants a classical game he can play 3… 4.43 – 38 20 – 24 20 – 24 4.29 x 20 15 x 24. If black wants a modern game he can play The Molimard-variation gets shape after 4… 17 – 21 5.37 – 31 (or 5.49 – 43) 23 – 29 6.34 x 23 Modern variation 18 x 29 7.33 x 24 20 x 29. More information at Frits Luteijn’s website: 3… 17 – 22 4.28 x 17 11 x 22 5.39 – 33 http://home.kpn.nl/dammen/molimard/

5.41 – 37 allows 16 – 21 6.31 – 26 20 – 24 5.37 – 31 14 – 20 6.49 – 43 10 – 14 7.26 x 28 24 x 22 with an easy game for black. 6… 2 – 7 would give white the extra 5… 13 – 18 6.44 – 39 19 – 23 opportunity 27 – 22 x 22! After 6… 10 – 14

7.27 – 22 18 x 27 8.31 x 22 would cost a piece White’s play is severely restricted for a couple because of 23 – 29 24 – 30 B+1. of moves. 22.40 – 35? is punished by a kingshot: 10 – 14 35 x 24 23 – 29 34 x 23 26 – 7.41 – 37 1 – 7 8.46 – 41 5 – 10 31 37 x 17 13 – 19 24 x 13 8 x 46 B+. 9.34 – 29 23 x 34 10.40 x 29 20 – 25 22.34 – 29 23 x 34 23.40 x 29 7 – 11 11.29 x 20 15 x 24 Prohibiting 33 – 28? by 26 – 31 13 – 18 B+ 24.41 – 36 10 – 14 25.36 – 31 with an interesting fight. Black wants to exploit the arc lock while white hopes his strong centre will give him the odds. See the Baliakin – Mogiljanski game (1987) in the appendix.

2) 14… 10 – 15 15.40 – 34 14 – 20 16.44 – 40 16 – 21 17.36 – 31 17 – 21 18.41 – 36 18.31 – 27? isn’t good because of the 12 – 17 27 x 16 26 – 31 37 x 26 19 – 23 28 x 30 17 x 46 kingshot. Now 18… 7 – 11 or 18… 12 – 18 is played with a complicated game that should be studied seriously. The nice F. de Koning – Thijssen The most interesting move in this position that game (2010) is shown in the appendix. GMI has emerged on the board hundreds of times, Kees Thijssen is a specialist in this Highland is 12.27 – 22 18 x 27 13.3 x 22 launching a opening. Highland attack. This opening is thus logically called the Highland variation or Highlander. Chogoliev-variation With piece 50 at <49> this move wouldn’t be possible because of the 19 – 23 kingshot. 1.32 – 28 17 – 22 2.28 x 17 11 x 22

12.27 – 22 18 x 27 13.31 x 22 16 – 21 This opening is a good choice for black players who want an active modern game. Fascinating White can’t go 14.36 – 31? because of 24 – 29 games emerge after the Korchow-variation: 33 x 24 19 x 30 35 x 24 13 – 19 24 x 13 9 x 36 3.37 – 32 12 – 17?! 4.31 – 26 6 – 11 4.36 – 31 B+1. He should go to <34> first and then play 8 – 12 5.32 – 27 36 – 31. Instead of 14.44 – 40 the more central White is threatening to play 41 – 36 with a 45 – 40 – 34 is also possible. strong fork lock, so black plays the logical 5… 16 – 21 6.27 x 16 22 – 28 7.33 x 22 18 x 14.44 – 40 36 Thousands of draughts lovers have played this We show two important variations. opening. The edge pieces make this type of game very attractive. 1) 14… 21 – 26 15.40 – 34 17 – 21 16.36 – 31 Frits Luteijn’s website gives much more 11 – 16 17.31 – 27 12 – 18 18.45 – 40 information about this so-called Korchow- opening: White can also choose 34 – 30 x 30. http://home.kpn.nl/dammen/Korchow/index.htm

18… 18 – 23 19.50 – 45 24 – 30 20.35 x 24 19 x 30 21.28 x 19 14 x 23 3.37 – 32 6 – 11 4.41 – 37 12 – 17 5.46 – 41

The alternative 5.34 – 30 7 – 12 6.30 – 25 aims at playing against an right wing or centre attack, for example: 6… 1 – 6 7.46 – 41 19 – 23 8.35 – 30 13 – 19 9.40 – 35 9 – 13 10.45 – 40 4 – 9 11.31 – 26 2 – 7 12.50 – 45 and black attacks playing 22 – 27, 22 – 28 or 23 – 28.

The Chizhov-attack

5… 8 – 12

Both 7 – 12 and 1 – 6 are played also. This is the most radical move. More safe play gives 12.34 – 29 23 x 34 13.40 x 29 or 13.39 x 1) 5… 7 – 12 6.34 – 29 30. Another option is 6.31 – 27 22 x 31 7.36 x 27 and 6.32 – 28 19 – 23 7.28 x 19 14 x 23 8.34 – 12… 5 – 10 13.40 – 34 15 – 20 29 23 x 34 9.40 x 29 10 – 14 10.35 – 30 20 – 14.30 – 25 10 – 15 15.25 x 14 9 x 20 25 11.30 – 24. 6… 19 – 23 7.40 – 34 With a fascinating fight in which white plays 7.31 – 27 22 x 31 8.36 x 27 23 x 34 9.39 x 30 against the right wing attack. for maneuvering play 9… 20 – 25 is met by 10.44 – 39 25 x 34 11.40 x 29! Schwarzman maneuvering-opening 7… 14 – 19 8.45 – 40 10 – 14 9.32 – 28 23 x 32 10.37 x 28 5 – 10 and black takes back the Baliakin was confronted with this opening in centre changing 19 – 23 x 23 at the next move the match from 1995 against Schwarzman. In or prepares this exchange with the sharp 11… his book Schwarzmanie (Schwarzmania) he 16 – 21. proposed to name this continuation the Schwarzman-opening. 2) 5… 1 – 6 6.34 – 29 19 – 23 7.40 – 34 14 – 19 8.45 – 40 8 – 12 9.32 – 28 23 x 32 10.37 x 1.32 – 28 17 – 22 2.28 x 17 12 x 21 28 20 – 24 11.29 x 20 15 x 24 12.41 – 37 16 – 21 13.31 – 26 11 – 16 with a Roozenburg The exchange is played by many strong game. players who like to maneuver first before the game gets concrete. White can respond in White’s most popular replies are 6.35 – 30 (20 many ways, the sharpest of which is – 25 7.32 – 28), 6.34 – 29 and our personal favorite: Right wing continuation

6.32 – 28 16 – 21 7.31 – 26 21 – 27 3.35 – 30 20 – 25 4.40 – 35 8.35 – 30 2 – 8 9.30 – 25 4.33 – 29 is interesting too. Black can go to <36> changing 27 – 31 x 31 but can also maintain his attack in spite of the 4… 15 – 20 5.45 – 40 20 – 24 weakness at <2>. This is the way Chizhov likes 6.33 – 29 23 x 34 7.39 x 28 to play. This opening generated many interesting games in which white has to play If black doesn’t want to play against the attack against black’s right wing attack. via 44 – 39 followed by 30 – 24 x 24 he can answer like Schwarzman played against 9… 19 – 23 10.28 x 19 14 x 23 Prosman (2004): 11.25 x 14 10 x 19 7… 11 – 17! 8.44 – 39 18 – 22 9.38 – 33 Black can also play even more sharp: 10… 1 – 6 11.37 – 31 and only then change 19 – 23. Prosman played 9.49 – 44 22 x 33 10.39 x 28 Chizhov played this way several times. and never managed to get a sound attack.

9… 14 – 20 10.50 – 45

It’s not a wrong idea to allow being locked: 10.37 – 32 20 – 24 11.31 – 27 22 x 31 12.36 x 27

10… 20 – 24

12.34 – 30

Many games have been played in recent years with this system.

The main line

3.37 – 32 7 – 12 4.34 – 29 1 – 7

Black can play 4… 11 – 17 5.40 – 34 6 – 11 6.31 – 26 1 – 6 7.45 – 40 19 – 23 8.42 – 37 14 – 19 9.48 – 42 10 – 14 10.50 – 45 5 – 10 11.37 – 31 2 – 7 12.41 – 37 20 – 25 13.46 – 41 15 –

20 14.35 – 30 In M. Kroesbergen – J. Lemmen 2006 white played a double pseudo sacrifice after which black went terribly wrong: 11.28 – 23?! 19 x 28 12.30 x 19 13 x 24 13.31 – 27 21 x 32 14.42 – 38 6 – 11 15.38 x 18 8 – 13?? Black should play 15… 8 – 12 16.33 x 22 12 x 23 17.47 – 42 17 x 28 18.34 – 30 25 x 34 19.40 x 18 = 16.33 x 22 17 x 28 17.49 – 44! 13 x 22 18.34 – 29 24 x 33 19.37 – 32 28 x 37 20.39 x 6 and with a piece more white won the game.

The wasp

In this well-known theoretical position black A more quiet approach for white is: can’t delay going to <27> any longer. 14… 10

– 15 isn’t possible because of 30 – 24 32 – 27 3.31 – 26 7 – 12 4.28 x 17 12 x 21 W+. 5.37 – 31 14… 21 – 27 15.31 x 22 17 x 28 16.33 x 22 18

x 27 17.32 x 21 16 x 27 18.29 x 18 13 x 22 With the intention to take back <27>. If white It’s also possible to take 18… 12 x 23 19.37 – plays 5.36 – 31 the smart 19 – 23 stops the 32 20 – 24 20.27 x 16 24 x 35 and black holds plan to take <27>. the centre.

19.37 – 32 11 – 17 20.32 x 21 20 – 24 21.41 – 5… 2 – 7 6.31 – 27 21 x 32 7.38 x 27 37 24 x 35 etc. 11 – 17 8.43 – 38 19 – 23 9.49 – 43

17 – 21! 5.40 – 34 19 – 23 6.45 – 40

At this moment white has no neutral move to White can choose to play a classical game: make the change. He should play either 36 – 6.41 – 37 14 – 19 7.33 – 28 and later black will 31 or 34 – 30. probably change 20 – 24 x 24, for example: 21

– 26 8.39 – 33 11 – 17 9.44 – 39 20 – 24 10.29 10.36 – 31 21 x 32 11.38 x 27 23 – 28 x 20 15 x 24. 12.33 x 22 16 – 21 13.27 x 16 18 x 36

6… 14 – 19 7.42 – 37 And piece <36> guarantees an interesting game. Chizhov won a strong game against Not allowing the chain lock with 19 – 24. Schwarzman during the world championship

2003 (see appendix). 7… 10 – 14 8.50 – 45 5 – 10

The Prosman-attack

Black can also go to <22> after 3.31 – 26, like GMI Erno Prosman likes to play.

3.31 – 26 7 – 12 4.26 x 17 11 x 22 5.37 – 31 16 – 21 6.31 – 26 22 – 27 7.26 x 17 12 x 21

17 11 x 22 19.37 – 31 with white playing against the right wing attack.

9.25 x 14 9 x 20 10.30 – 25 4 – 9 11.25 x 14 9 x 20 12.37 – 31 10 – 14 13.41 – 37 5 – 10 14.46 – 41 2 – 7 15.38 – 32 21 – 27 16.32 x 21 16 x 27 17.31 x 22 18 x 27 18.34 – 30 20 – 24 19.30 – 25

9.31 – 26

9.47 – 42 11 – 17 10.31 – 26 7 – 11 11.37 – 31 2 – 7 12.46 – 41 20 – 25 13.35 – 30 leads to a position we’ve seen before… 9.47 – 42 21 – 26 10.32 – 28 23 x 32 11.37 x 28 26 x 37 12.41 x 32 19 – 23 13.28 x 19 14 x 23 can get interesting after 14.35 – 30 20 – 25 15.30 – 24.

9… 21 – 27 10.32 x 21 16 x 27 Black has a right wing attack but a weak left wing.

9… 20 – 25 10.26 x 17 11 x 22 gives white an easy right wing attack after 11.32 – 28 23 x 32 The eagle 12.37 x 17 12 x 21 13.29 – 24 19 x 30 14.35 x 24. 1.32 – 28 18 – 22 2.37 – 32 12 – 18 3.41 – 37 11.48 – 42 20 – 25 12.37 – 31 12 – 17 13.31 x 22 17 x 28 14.33 x 22 18 x 27 White can switch to another modern opening 15.29 x 18 13 x 22 by playing 34 – 29 here or at the next move.

Black has a right wing attack, but it is not so 7 – 12 4.46 – 41 1 – 7 strong since white can change piece <27> easily. White can choose from 3 popular moves:

Surrounding variation Mutual outposts variation

A recent development in this opening is 1) 5.34 – 29 19 – 23 6.28 x 19 14 x 34 7.40 x 29

3.34 – 30 7 – 12 4.30 – 25 7.39 x 30 leads to maneuvering before the White wants to play against the black centre. game gets more concrete.

He could be playing against a right wing attack later. 7… 10 – 14 8.35 – 30 20 – 25 A variation that is frequently played 9.30 – 24 14 – 20

4… 11 – 17 5.31 – 26 6 – 11 Andreiko – Sijbrands (1969) was 9… 5 – 10 6.40 – 34 1 – 6 7.45 – 40 19 – 23 10.24 – 20? 15 x 24 11.29 x 20 10 – 15 12.45 8.35 – 30 14 – 19 – 40 15 x 24 13.33 – 28 22 x 33 14.38 x 20 16 – 21! 15.31 – 26 11 – 16 16.36 – 31 7 – 11 8… 13 – 19 9.40 – 35 9 – 13 10.44 – 40 4 – 9 17.20 – 15 11.50 – 45 2 – 7 12.37 – 31 18 – 22 13.31 – 27 White couldn’t play 17.31 – 27 because of 4 – 22 x 31 14.26 x 37 is also played after which 10! 18.20 – 15 18 – 23! 19.15 x 4 13 – 18 20.4 black continues 14… 17 – 22 like the x 22 17 x 28 21.26 x 17 11 x 31 22.37 x 26 28 Schwarzman – Chizhov game (1998) in the x 46 B+. appendix or 14… 12 – 18 15.37 – 31 7 – 12 17… 18 – 22 18.41 – 36 22 – 28 19.32 x 23 21 16.31 – 26 21 – 27 17.41 – 37 17 – 21 18.26 x – 27 20.31 x 22 17 x 19 with a good game for black, who nevertheless lost the game.

x 45 33 – 29 23 x 34 41 – 37 20 x 29 38 – 33 10.32 – 28 29 x 38 43 x 5. Therefore black has to play 13 – 19 x 19 at the 16th or 17th move. White can also try 10.44 – 40 5 – 10 11.50 – After 15.39 – 34 10 – 14 16.40 – 35 14 – 19 44 9 – 14 12.31 – 27 22 x 31 13.36 x 27 17 – 17.38 – 32 etc. the king is caught by 23 … 21 – 22 27 24.41 – 37 8 – 12 25.1 x 31 13 – 18 26.31 x 13… 3 – 9 14.29 – 23! 18 x 29 15.27 – 22 17 x 13 9 x 18 =. 28 16.32 x 34 20 x 29 17.34 x 23 gives white a solid centre attack. 15… 9 – 14 14.37 – 31 3 – 9 15.42 – 37 14 – 19 16.41 – 36 16.38 – 32 27 x 38 17.43 x 32 19 x 30 17.29 – 23 18 x 29 18.33 x 35 22 – 28 19.32 x 23 25 – 30 20.35 x 24 20 x 18 with an Now <9> is opened white can play this move. equal position. Another possibility is 16.42 – 37 27 – 32 17.38 x 27 22 x 42 18.47 x 38 3 – 9 19.41 – 37 18 – 10… 16 – 21 11.31 – 26 11 – 16 12.37 – 32 23 20.28 x 19 14 x 34 21.39 x 30! 21 – 27 13.32 x 21 16 x 27 Preventing the problems that arise after 21.40 x 29? 10 – 14 22.44 – 40 14 – 19 23.40 – 35 19 x 30 24.35 x 24 9 – 14 25.45 – 40 4 – 10 26.49 – 44 12 – 18! (threatening 17 – 21 8 – 12 14 x 45 B+) 27.39 – 34 7 – 12 28.43 – 39 14 – 19 and after changing back white’s right wing is ugly. 21… 25 x 34 22.40 x 29 10 – 14 23.44 – 40 White’s outpost is completely safe now, 14 – 19 is punished by 33 – 28 19 x 30 28 – 22 17 x 28 38 – 33 28 x 39 43 x 5 W+.

17… 4 – 9?!

17… 14 – 19 18.40 – 35 19 x 30 19.35 x 24 17 White has to watch some shots. – 21 20.26 x 17 22 x 11 21.42 – 38 10 – 14 1) 41 – 37? 27 – 32! 38 x 27 22 x 31 36 x 27 22.44 – 40 18 – 22 23.28 x 17 11 x 22 followed 17 – 22 28 x 17 12 x 41 47 x 36 18 – 23 29 x by an attack at <24> has also been tried, see 18 20 x 47 B+. Gantwarg – Wiersma in the appendix. 2) 42 – 37? 18 – 23! 28 x 19 27 – 32 38 x 18 4 – 9 is a move introduced by former world 12 x 34 39 x 30 20 x 38 43 x 32 13 x 35 B+1. champion late Jannes van der Wal. After the 3) 38 – 32? 27 x 38 43 x 32 17 – 21! 26 x 17 forced reply of white black takes a deep 12 x 21 28 x 26 18 – 23 29 x 18 20 x 27 B+1. kingshot, getting a king for three pieces.

14.45 – 40 18.42 – 38

44.45 – 40 isn’t wrong for after 18 – 23 white takes 29 x 18 12 x 32 33 – 28! 20 x 29 28 x 37 8 – 12 37 – 32 winning back the piece with a good game for white.

14… 5 – 10 15.50 – 45

After 15.39 – 34?! 9 – 14?! white can play the surprising move 16.40 – 35! after which 14 – 19 is met by the kingshot 17.38 – 32! 19 x 39 18.43 x 34 27 x 38 19.26 – 21 17 x 26 20.28 x 17 12 x 21 21.29 – 24 20 x 40 22.50 – 45 42 x 33 23.45 x 1 and white can hide his king behind his own pieces: 10 – 14 35 – 30 25 x 34 18… 22 – 27! 19.32 x 21 25 – 30 1x45 followed by 45 – 50. 20.24 x 35 18 – 23 21.29 x 18 12 x 34 After 15… 9 – 14 16.40 – 35 3 – 9 17.44 – 40 22.21 x 1 20 – 25 23.40 x 29 13 – 18 14 – 19? Is even worse, white can take a 24. 1 x 23 25 – 30 25.35 x 24 15 – 20 kingshot with both 18.38 – 32 and 18.36 – 31! 26.24 x 13 8 x 50 W+, while 17… 18 – 23? 18.28 x 19 14 x 23 19.29 x 18 12 x 23 is punished by 34 – 30! 25

Black can get his king behind his pieces and 13 17.39 – 34 17 x 28 18.34 x 32 with an equal has the odds. See L. Thijssen – B. Terwel position). (1996) in the appendix. 11.44 – 39? would give up a defender of piece 24, while black is aiming to attack the outpost The black rush several times.

2) 5.34 – 30 20 – 25 6.30 – 24 19 x 30 11… 5 – 10 7.35 x 24 14 – 20 8.33 – 29 After 11… 16 – 21 12.31 – 26 11 – 16 13.44 – White can also play 8.39 – 34 20 x 29 9.34 x 39! Is possible, with the idea of 14 – 19 14.40 – 23 18 x 29 10.33 x 24 22 x 33 11.38 x 29 with 35 19 x 30 15.35 x 24 7 – 11 16.39 – 34! 9 – a right wing attack. 14 17.43 – 39 and 14 – 19 is met by 28 – 23! 19 x 28* 32 x 23 +/- like in Sijbrands – J. de 8… 22 x 33 9.39 x 28 Jonge (blindfoldgame 1981).

12.47 – 42 14 – 19 13.40 – 35 19 x 30 14.35 x 24 10 – 14 15.44 – 40 14 – 19 16.40 – 35 19 x 30 17.35 x 24 9 – 14 18.45 – 40 3 – 9

The best way to defend piece 24 against the black rush is to keep piece 50 at its spot. After 19.50 – 45? 14 – 19 20.40 – 35 19 x 30 21.35 x 24 9 – 14 22.45 – 40 14 – 19 23.40 – 35 19 x 30 24.35 x 24 4 – 9 25.49 – 44 9 – 14 26.44 – 40 14 – 19 white can’t play 32 – 27? 19 x 30 27 x 9 8 – 13 9 x 18 12 x 45, so he must allow 27.40 – 35 19 x 30 28.35 x 24 22 – 27 29.31 x 9… 18 – 22 22 13 – 18 30.22 x 13 8 x 30 and white’s right wing isn’t defended well. 9.. 17 – 21 is another frequently played variation. After 10.29 – 23 20 x 29 (black can 19.49 – 44 14 – 19 20.40 – 35 19 x 30 take otherwise too) 11.23 x 34 21 – 26 white 21.35 x 24 9 – 14 22.43 – 39 4 – 9 controls the centre but also a weak piece at 23.44 – 40 14 – 19 24.40 – 35 19 x 30 <41>. See the nice Gantwarg – Wirny (1983) 25.35 x 24 9 – 14 26.48 – 43! game in the appendix. Now 14 – 19 can be met by 32 – 27 19 x 30 27 10.38 – 33 10 – 14 x 9 8 – 13 9 x 18 12 x 34 37 – 32 stopping the rush attack at white’s right wing. Black can play the 13 – 18 9 – 13 22 – 27 Changing 26… 22 – 27 27.31 x 22 13 – 18 scheme as an alternative. 28.22 x 13 8 x 30 gives white control over the centre.

3) 5.31 – 26

We have to consider two completely different lines.

Roozenburg-variation

3.1) 5… 19 – 23 6.28 x 19 14 x 23 7.32 – 28 23 x 32 8.37 x 28

8.33 – 28 22 x 33 9.39 x 19 13 x 24 has no point for white, since black builds the cannon 11.42 – 38 playing 10 – 14 9 – 13 5 – 10 14 – 19 10 – 14 (4 – 9). 11.43 – 39 can also be played, but allows 22 – After 5.34 – 29 23 x 34 6.40 x 29 black simply 27 12.31 x 22 13 – 19 13.24 x 13 9 x 38 14.48 takes a right wing attack with 22 – 27 x 27. – 42 (20 – 24 15.29 x 9 38 x 28 16.28 – 22 4 x

8 … 16 – 21 9.41 – 37 Black can also choose 13 – 19 (Dibman- variation) or the Clerc – variation 21 – 27 7.31 Another plan is trying to block the Roozenburg x 22 18 x 27 8.28 x 19 13 x 24 9.32 x 21 16 x attack playing 9.38 – 32 11 – 16 10.41 – 37 21 27 – 27 11.32 x 21 16 x 27 12.37 – 31 10 – 14 7.28 x 19 14 x 23 8.31 – 27 with a right wing 12… 13 – 19? Is punished by 13.26 – 21 W+. lock for black. 13.43 – 38 5 – 10 14.49 – 43 trying to attack <27>. Russian variation

9… 21 – 27 6.37 – 31 20 – 24 2) 2 … 11 – 16 3.38 – 32 7 – 11 4.37 – 31 19 – 23 5.28 x 19 14 x 23 6.31 – 27 23 – 28 7.32 x Black now has a sound Roozenburg attack. 23 18 x 38 8.43 x 32 with again a right wing Usually white is going to attack <27> lock. immediately playing 47 – 41 – 37 – 32. Black can also play other kinds of systems like Fork-lock-variation 3.38 – 32 18 – 22 4.43 – 38:

3.2) 5… 20 – 25 6.37 – 31 14 – 20 1) 4… 7 – 11 5.49 – 43 1 – 7 6.37 – 31 21 – 27 7.41 – 37 10 – 14 8.47 – 41 5 – 10 7.32 x 21 16 x 27 8.42 – 37 11 – 16 9.37 – 32 9.32 – 27 19 – 23 10.28 x 19 14 x 23 16 – 21 10.41 – 37 20 – 24 and black plays the 11.34 – 30 25 x 34 12.40 x 29 23 x 34 fascinating Partie Bonnard in the so-called 13.39 x 30 20 – 25 14.44 – 39 25 x 34 Valkenburg-variation.. Many games continue 15.39 x 30 10 – 14 11.47 – 42 13 – 18 12.28 – 23 18 x 29 13.34 x 23 18 x 28 14.32 x 23 7 – 11 15.46 – 41 14 – 19 16.23 x 14 10 x 19 with an open Bonnard.

2) 4… 13 – 18 5.49 – 43 9 – 13 6.37 – 31 21 – 27 7.32 x 21 16 x 27 8.42 – 37 19 – 23 9.28 x 19 14 x 23 with a right wing attack for black.

The opening 1.32 – 28 16 – 21 is extensively covered in a book by L.J. Koops.

Dutch variation

2.31 – 26 18 – 22 3.37 – 32 11 – 16 4.41 – 37 7 – 11 5.34 – 29 1 – 7 From this interesting fork-lock position many 6.46 – 41 games have been played. White can also choose to play against a right The black panther wing attack with 6.40 – 34 13 – 18 7.45 – 40 19 – 23 8.28 x 19 14 x 23 9.46 – 41 21 – 27 1.32 – 28 16 – 21 10.32 x 21 16 x 27 11.29 – 24 20 x 29 12.33 x 24. A nice example is the Gerritsen – Domchev 1… 16 – 21 is by far the sharpest reply to 1.32 (2010) game in the appendix. – 28, inviting white to lock black’s right wing playing 2.31 – 26. Sometimes black even Black can now try to play a Roozenburg attack: keeps the lock on the board deliberately to 6… 20 – 24 7.29 x 20 15 x 24 8.40 – 34 13 – complicate the game: 18 9.37 – 31 21 – 27 10.32 x 21 16 x 27 Because this variation isn’t without danger Right wing lock variation many players choose 6… 20 – 25. White can now move either 7.29 – 23 or 7.40 – 34. 1) 2… 11 – 16 3.37 – 32 7 – 11 4.36 – 31! 4.41 – 37 is met by 19 – 23 5.28 x 19 14 x 23 Andreiko-variation and white can’t keep the lock. Black wants to play 21 – 27 x 27 at the next move with a 6… 20 – 25 7.40 – 34 sound right wing attack. 4… 19 – 23 5.28 x 19 14 x 23 6.33 – 28! 7.29 – 23 21 – 27 8.32 x 21 16 x 27 9.35 – 30! 6.31 – 27? 23 – 28 7.32 x 23 21 x 32 8.38 x 27 25 x 34 10.39 x 30 is also interesting. 18 x 38 9.43 x 32 favors black. 6 ... 9 – 14 79

10.28 – 23 19 x 28 11.32 x 23 isn’t bad either, for example: 11… 13 – 18 12.35 – 30 9 – 13 13.40 – 35 21 – 27 14.30 – 24 27 – 31 15.36 x 27 22 x 31 with an exciting play.

The hedgehog

1.32 – 28 17 – 21

Playing 2.31 – 26 11 – 17 (or 12 – 17) can lead to the 1.32 – 28 16 – 21 opening, but black can also choose to play 2… 19 – 23 with maneuvering play. 10… 15 – 20 is punished by the kingshot 11.36 2.37 – 32 21 – 26 3.32 – 27 26 x 37 4.41 x 32 – 31! 27 x 36 12.23 – 18 12 x 32 13.38 x 18 13 delivers white a quick development of his left x 22 14.37 – 31 36 x 27 15.30 – 24 20 x 38 wing and 4 temps. 16.43 x 1 +. The main line 10… 11 – 16 11.44 – 39 7 – 11 2.34 – 29 12.30 – 24! 19 x 30 13.36 – 31 27 x 36 14.23 – 19 14 x 32 15.38 x 7 8 – 12 16.7 x 18 13 x 22 2.33 – 29 can be met by the sharp 20 – 25 or 17.40 – 35 favors white. 2… 21 – 26 neglecting the simplifying 28 – 23 The calm 10… 13 – 18 is the best continuation 29 – 24 34 x 32 exchange. for black leading to a centre attack after 11.37 – 31 18 x 29 12.33 x 13 8 x 19 13.41 – 37 22 x 2… 21 – 26 33 14.31 x 22 17 x 28 15.38 x 29. Dutch GMI Johan Krajenbrink likes to play 2… 7… 14 – 20 8.45 – 40 10 – 14 11 – 17 3.40 – 34 18 – 22. 9.50 – 45 4 – 10 3.40 – 34 16 – 21

Fascinating play emerges after 3… 11 – 17 4.45 – 40 6 – 11 5.37 – 32 26 x 37 6.42 x 31 19 – 23 7.28 x 19 14 x 23 8.35 – 30 20 – 25 9.41 – 37 White can’t go to <24> yet, because of 13 – 19 B+1. 9… 16 – 21 10.47 – 41 21 – 26 and black tries to play against a right wing attack, for example 11.50 – 45 10 – 14 12.30 – 24 11 – 16 13.32 – 28 23 x 32 14.37 x 28 26 x 37 15.41 x 32 16 – 21 etc.

9… 4 – 10 is the characteristic move of the 4.45 – 40 11 – 16 Andreiko-variation. 9… 5 – 10 allows the strong centre attack 28 – 23 x 23. 4 – 10 gives We look at two possible continuations for black a better construction to play against this white: attack. When confronted with this position in the Sijbrands – Andreiko match of 1973 5.37 – 32 26 x 37 6.42 x 31 21 – 26 7.47 – 42 Sijbrands considered 10.29 – 23 21 – 27 11.32 26 x 37 8.42 x 31 x 21 16 x 27 to be too dangerous and 8.32 – 27 26 x 37 9.41 x 32 19 – 23 10.28 x 19 simplified the game playing 10.32 – 27 21 x 23 14 x 23 11.35 – 30 has grown more popular 11.29 x 27 although he later won the game by recently. a shot. 8… 6 – 11 Later 10.29 – 23 was played increasingly, with Black wants to answer 9.41 – 37 with 17 – 21! the sharpest line being 10… 21 – 27 11.32 x 10.31 – 26 21 – 27 11.32 x 21 18 – 23 12.29 x 21 16 x 27 12.36 – 31?! 27 x 36 13.38 – 32 18 12 x 41 White wins a lot of temps so in this After this pseudo sacrifice white is threatening variation black will strive for a classical game. 23 – 18 34 – 30 40 x 27 so black will have to Pieces 21 / 26 are somewhat passive. return the piece 25 – 30 14.34 x 25 leading to 9.50 – 45 1 – 6! a very complicated game.

Black still answers 16 – 21 to 10.41 – 37 and The Russian bear the alternative 10.48 – 42 16 – 21 11.31 – 26 20 – 24 12.26 x 17 12 x 21 13.29 x 20 15 x 24 1.32 – 28 20 – 25 2.37 – 32 gives black a good classical game. White’s left wing is weakened, so it’s hardly possible to 2.33 – 29 is met by 17 – 22 x 22, 17 – 22 x 21 break open the classical structure of the game. 16 – 21 or 18 – 22, all with an interesting game. Schwarzman-variation 2… 15 – 20 3.41 – 37 10 – 15 4.46 – 41 5.38 – 32 21 – 27 There are several other options here. For 5… 20 – 24 6.29 x 20 15 x 24 7.31 – 27 18 – example 4.34 – 30 25 x 34 5.39 x 30 20 – 25 23 8.43 – 38 10 – 15 9.49 – 43 14 – 20 10.27 – 22 24 – 29 11.33 x 24 20 x 29 leads to a 6.30 – 24 (6… 44 – 39 25 x 34 7.39 x 30 15 – mutual classical attack, with a complicated 20 8.44 – 39 20 – 24 gives black a good game. This is the Bezwerzjenko-variation. classical game) 6… 19 x 30 7.35 x 24 leads to a right wing attack. 6.31 x 22 18 x 38 7.43 x 32 Another possibility is 4.34 – 29 17 – 22 5.28 x 17 11 x 22 6.46 – 41 5 – 10 7.40 – 34 7 – 11 6.32 x 21 26 x 17 7.42 – 38 19 – 23 8.28 x 19 (or 6 – 11) 8.45 – 40 11 – 17 9.50 – 45 6 – 11 14 x 23 9.35 – 30 can get very interesting too. which leads to the Vermin-variation. A 7… 16 – 21 8.36 – 31 theoretical line is 10.31 – 26 2 – 7 11.37 – 31 White can also play the fascinating 11.32 – 28! 8.42 – 38 can also be considered, because it is 19 – 23 12.28 x 19 14 x 23 13.29 – 24 20 x 29 more flexible although it doesn’t stop 21 – 27 x 14.33 x 24 surrounding the black centre, that is 27. The classical reply 20 – 24 9.29 x 20 15 x weakened by the absence of the base piece at 24 can be met by 10.32 – 37 followed by 37 – <2>. 31 x 32 developing the left wing nicely. 11… 19 – 23 12.32 – 27 14 – 19 13.29 – 24 20 8… 6 – 11 9.42 – 38 11 – 16 10.49 – 43 x 29 14.33 x 24 19 x 30 15.35 x 24 23 – 28 16.38 – 33 with a sharp game.

4… 5 – 10

4… 17 – 21 5.31 – 26 5 – 10 is the so-called Memel-variation.

5.31 – 27

White can also go to the edge himself: 5.31 – 26 20 – 24 6.36 – 31 15 – 20 7.41 – 36 18 – 23 8.34 – 29 23 x 34 9.39 x 30 25 x 34 10.40 x 29

13 – 18 11.29 – 23 18 x 29 12.35 – 30 24 x35 Usually black tries to go to a fork-lock: 13.33 x 15 is one of the lines that is gaining 10… 20 – 25 11.47 – 42 15 – 20 12.50 – 45 popularity recently. White can launch a centre attack 12.29 – 24 20 x 29 13.34 x 23. 5… 19 – 23 6.28 x 19 14 x 23 12… 10 – 15 13.31 – 27 19 – 24 14.37 – 31 Escaping from the fork-lock 14.34 – 30 25 x 23 The idea to occupy <25> & <23> 15.28 x 30 12 – 18 gives black a more flexible simultaneously was introduced by former world position. White’s left wing looks offbeat with the champion Andris Andreiko. Black’s centre is undeveloped piece at <46>. strong enough to allow this 23 / 25 bond. 14… 26 x 37 15.42 x 31 and black has to decide whether he wants to eliminate 34 – 30 7.33 – 28 9 – 14 8.28 x 19 14 x 23 by playing 13 – 19?! or play more quietly with 9.39 – 33 either 15… 5 – 10 or 15… 21 – 26. After 9.38 – 33 10 – 14 10.33 – 28 black can’t play neither 14 – 19? nor 13 – 19? and thus 81 has to change again with 10… 4 – 10 11.28 x position that has occurred many times already. 19 14 x 23 which indeed is played, but 22.38 – 33? is now punished by 16 – 21 23.27 because in this variation the black position is x 7 23 – 29! 24.33 x 24 19 x 30 25.35 x 24 20 x weakened, more popular has become 9.38 – 29 26.34 x 23 18 x 29 27.7 x 18 13 x 35 B+1. 33 13 – 19 10.33 – 28 17 – 22 11.28 x 17 11 x The alternative 22.39 – 33 23 – 29! favors 31 12.36 x 27 10 – 14 and black keeps the black, especially after 23.34 x 23 18 x 29 24.33 initiative. x 24 19 x 30! 25.35 x 24 20 x 29 for example 26.27 – 22 14 – 19 27.43 – 39 16 – 21! and 9… 10 – 14 10.44 – 39 13 – 19 28.31 – 27 is met by 11 – 17 25 – 30 – 34 19 – 23 13 x 44 B+.

15… 12 – 17 16.42 – 38 17 – 22 17.28 x 17 11 x 22 18.47 – 42 7 – 12 19.33 – 28 22 x 3 3 20.39 x 28 2 – 8 21.44 – 39

11.49 – 44

This is a modern continuation. The most popular way to continue used to be 11.50 – 44

11… 17 – 21

21.43 – 39? 20 – 24 22.49 – 43 24 – 29! favors 11… 4 – 9? 12.27 – 21! gives white a kingshot black. to <4>. 21.44 – 39 can’t be met by 16 – 21? 23.27 x 16

6 – 11 24.16 x 7 23 – 29 25.34 x 23 18 x 29 12.36 – 31 26.7 x 18 13 x 44 because of 27.40 – 34 29 x White has all kind of alternatives here. World 40 28.45 x 34 44 – 50 29.49 – 44 50 x 30 champion juniors 2011 Roel Boomstra 30.35 x 2 W+ introduced 12.33 – 28 21 – 26 13.39 – 33 8 – 13 14.35 – 30?! followed by 4 – 9 15.34 – 29 22… 6 – 11 23.39 – 33 23 – 29 24.34 x 23 23 x 34 16.30 x 39. White holds the centre and After 24.33 x 24 19 x 39 25.43 x 34 14 – 19 can later launch a Highland-attack. 26.49 – 43 19 – 24 only 27.28 – 22 is left for 12… 21 – 26 13.41 – 36 8 – 13 white. 28.27 – 22 18 x 27 29.31 x 22 loses a 14.33 – 28 4 – 9 piece by 24 – 29 & 25 – 30 B+1 and 28.43 – 39 loses to 16 – 21 27 x 7 24 – 30 35 x 24 20 x 14… 2 – 8 wouldn’t allow 15.39 – 33? because 29 34 x 23 18 x 29 7 x 18 13 x 35 B+1. of the 16 – 21 18 – 22 23 – 29 kingshot. However black rather allows 39 – 33? as this is 24… 18 x 29 25.33 x 24 19 x 30 26.35 x 24 20 worse than 38 – 33 which gives a better x 29 with about equal play. This position is also distribution of pieces. possible with 49 at <47>, as we saw, but now white’s distribution of pieces is better. 15.38 – 33 11… 17 – 21 15.39 – 33 2 – 8 16.44 – 39 12 – 17 17.49 – 44 11… 8 – 13 would allow the 27 – 22 34 – 30 17 – 22 18.28 x 17 11 x 22 19.33 – 28 22 x 33 exchange although this isn’t attractive for white 20.39 x 28 7 – 12 21.44 – 39 6 – 11 leads to a either, so play continues 12.33 – 28 2 – 8

13.39 – 33 4 – 9 14.44 – 39 and black should choose between 17 – 21 and 17 – 22.

12.36 – 31 21 – 26 13.33 – 28 8 – 13 14.39 – 33 2 – 8 15.47 – 41

This move, an idea introduced by Harm Wiersma, looks strange at first sight, because it creates a dangling piece at <41>. The point is however that black now can’t play 12 – 17 due to 34 – 30 40 x 29 27 – 21 32 x 23, so he must play 20 – 24 or 23 – 29 with a 6.47 – 42 complicated game, in which white’s control over the centre should compensate the White can play the Molimard-exchange to weakness at <41>. <22> immediately, like in Clerc – Chizhov Wch 2001 (see appendix).

6… 12 – 18 7.28 – 22 17 x 28 9.33 x 22 18 x 27 10.31 x 22 8 – 12 11.32 – 27 2 – 8 12.37 – 31 12 – 18 13.31 – 26 7 – 12 14.27 – 21 16 x 27 15.22 x 31

White wants to play against black’s left wing, surrounding the centre.

Semi-classical variation

15… 23 – 29 2) 2… 18 – 23 3.30 – 25 23 x 32 4.37 x 28 13 – 18 5.41 – 37 17 – 21 15… 20 – 24 16.34 – 29 23 x 34 17.40 x 20 15 x 24 18.44 – 39 favors white. This variation can be played if black wants to 16.34 x 23 18 x 29 17.33 x 24 20 x 29 surround the white centre. It is similar to 1.31 – 18.44 – 39 14 – 20 19.50 – 44 27 19 – 23 2.33 – 28 17 – 21 3.28 x 19 14 x 23 4.38 – 33 (with reversed colors). with a complicated game. 1.32 – 28 20 – 24 2.37 – 32 18 – 23 is often The cow played, but no clear theoretical lines have appeared yet. 1.32 – 28 20 – 24 2.34 – 30 1.33 – 29 The diamond This opening gives black two interesting possibilities: Roozenburg-opening

1) 2… 14 – 20 3.30 – 25 10 – 14 1.33 – 29 19 – 23 2.25 – 30 20 – 25 4.37 – 32 18 – 23 5.42 – 37 2… 14 – 19 can be met by 3.30 – 24 3.30 – 25 Now 5… 17 – 21 can be met by 6.31 – 26 or 3.40 – 35. (which is not possible after the normal 5.41 – After 3.30 – 25 the most active move is 3… 17 37) 5… 12 – 18 is met by 6.39 – 34! Therefore – 22 4.25 x 14 9 x 20. black usually plays: The alternative 3… 10 – 14 4.39 – 33 17 – 22 5.44 – 39 11 – 17 6.32 – 28 23 x 32 7.37 x 28 5… 4 – 10 4 – 10 8.29 – 23! 18 x 29 9.34 x 23 gives the odds to white.

3.40 – 35 10 – 14 4.30 – 25 20 – 24 5.29 x 20 1) 13.31 – 26 27 – 32 14.38 x 27 22 x 42 15.47 15 x 24 6.34 – 30 5 – 10 7.45 – 40 17 – 21 x 38 and black should try to surround white’s 8.39 – 34 and if black goes to <26> white will attack. change 32 – 28 x 32 and build the power block to put pressure at <24>. 2) 12.47 – 41 1 – 6 13.37 – 32 11 – 16 14.32 x 21 17 x 37 15.41 x 32 9 – 14 16.28 x 17 12 x 3.40 – 35 14 – 20 21 17.33 – 28 7 – 12 and black plays against the right wing attack again. 3… 14 – 19 4.30 – 24 19 x 30 5.35 x 24 9 – 14 5… 10 – 14 6.24 – 19 13 x 33 7.39 x 10 5 x 14 3) 12.46 – 41 1 – 6 13.48 – 42 9 – 14 14.31 – 8.38 – 33 favors white. 26 6.45 – 40 14 – 20 7.50 – 45 3 – 9 8.38 – 33 10 White has to take care: after 14.28 – 23? 5 – – 14 9.33 – 28 5 – 10 10.28 x 19 14 x 23 11.43 10!! he has no good move left! 15.37 – 31 is – 38 17 – 22 12.31 – 27 22 x 31 13.36 x 27 punished by 27 – 32! 16.38 x 27 22 – 28 17.23 leads to a Roozenburg attack. x 32 13 – 19 18.24 x 22 17 x 46 B+. Check yourself how to punish the other possible white 4.44 – 40 10 – 14 5.38 – 33 14 – 19 moves. 6.30 – 24 19 x 30 7.35 x 24 17 – 22 14… 27 – 31 15.36 x 27 22 x 31 16.37 – 32 31 8.42 – 38 11 – 17 9.32 – 28 23 x 32 – 36 with an interesting game. 10.37 x 28 The Keller-opening White takes a right wing attack. After 9.50 – 44 6 – 11 10.47 – 42 5 – 10 black doesn’t have to 1.33 – 29 17 – 22 2.39 – 33 11 – 17 fear the attack at <23>, because 11.33 – 28 23 3.44 – 39 6 – 11 4.50 – 44 1 – 6 x 32 12.38 x 18 9 – 14 13.38 – 33 14 x 23 5.31 – 26 16 – 21 6.32 – 28 19 – 23 14.33 – 28? gives black the elegant kingshot 7.28 x 19 14 x 23 14… 17 – 22!! 15.28 x 6 23 – 28 16.32 x 23 12 – 17 17.23 x 21 16 x 27 18.31 x 22 13 – 18 These moves lead to the fascinating Keller- 19.22 x 13 8 x 50 + as was performed in opening. The amount of theory of this opening Tsinman – Kalmakov 2000 and Skliarow – De is huge. I wrote a series of articles on this Voogd 2004. opening in draughts magazine Hoofdlijn (consisting of 37 articles in total!). You can also 10… 16 – 21 11.41 – 37 find theory about this opening at the Luteijn website. Frits Luteijn has played many games 11.38 – 32? fails due to 21 – 27 12.32 x 21 17 in this system and is known to be a x 37 13.41 x 32 6 – 11! 14.28 x 6 18 – 23 connoisseur on the Keller-opening (and many 15.29 x 18 20 x 27 B+1. other openings).

11… 21 – 27 12.50 – 44 6 – 11 The Hedgehog

1.33 – 29 17 – 21

This opening moves can lead to the same variations as after 1.32 – 28 17 – 21 2.33 – 29 or 2.34 – 29, but white can also try the modern system 2.39 – 33 21 – 26 3.44 – 39 11 – 17 4.50 – 44 6 – 11 5.34 – 30.

Krajenbrink-attack

1.33 – 29 16 – 21 2.31 – 26 11 – 16 In this position with mutual outposts white holds the centre and can choose from: These moves usually lead to a sharp game. We show what is called the Krajenbrink-attack:

3.37 – 31 2… 13 x 22 has been played many times by former world champion Chogoliev. White can Another main line is 3.39 – 33 7 – 11 4.44 – 39 try to get a fork-lock playing 3.31 – 26 12 – 18 1 – 7 5.50 – 44 and black can play 5… 18 – 4.36 – 31 7 – 12 5.32 – 27 1 – 7 6.38 – 33 9 – 22, 5… 20 – 25 or 5… 19 – 23 all with a 13 7.42 – 38 19 – 23 8.41 – 36 as happened in complex game. Sijbrands – Chogoliev 1990.

3… 6 – 11 4.31 – 27 18 – 22 5.27 x 18 3.34 – 30 7 – 12 4.30 – 25 13 – 18 13 x 22 6.41 – 37 9 – 13 Black has to correct his division of pieces and reinforce the right wing. White must choose either the scheme 5.39 – 33 6.44 – 39 7.40 – 34 or 5.40 – 34 6.34 – 30 7.45 – 40 and if white decides to play against a future black attack the games gets exciting.

The buffalo

1.33 – 29 18 – 22 2.31 – 26 20 – 24 3.29 x 20 15 x 24

Black can also choose 2… 19 – 24 3.39 – 33 7.39 – 33 22 – 27 4.32 x 21 16 x 27 5.37 – 32 11 – 16 6.32 x 21 16 x 27 7.41 – 37 17 – 22 8.44 – 39 Sijbrands introduced the Springer Contra 8.34 – 30?? 27 – 31 B+1 Attaque in this position, playing 7.29 – 23 19 x 8… 14 – 19 9.50 – 44 6 – 11 10.46 – 41 1 – 6 28 8.32 x 23. 11.38 – 32 27 x 38 12.43 x 32 but 2… 20 – 24 After 7.39 – 33 black can play either 7… 21 – x 24 is much more interesting! 27 8.32 x 21 16 x 27 or 7… 13 – 18 8.44 – 39 19 – 23, see the Gantwarg – Sijbrands (1988) 4.34 – 30 game in the appendix. Other moves aren’t serious. 4.37 – 31 allows 24 – 29 34 x 23 19 x 28 32 x 23 22 – 27 31 x The classical reply 22 17 x 19 and 4.38 – 33 22 – 28! Is no 1.33 – 29 20 – 24 2.29 x 20 15 x 24 problem for black either.

3.32 – 28 17 – 21 leads to a classical game. More interesting is 3.32 – 28 16 – 21 4.31 – 26 4.39 – 33 21 – 26 is also played. 4… 21 – 27 5.38 – 33 5.37 – 31 18 – 23 leads to a centre attack for black 5… 27 – 32 6.28 – 22 17 x 28 7.33 x 22 18 x 27 8.37 x 28 11 – 17 9.39 – 33 13 – 18 10.44 – 39 18 – 22 like Mathijssen – Dolfing (2002).

3.34 – 30 is also popular, for example 18 – 23 4.39 – 33 Black has two continuations, both leading to White can also choose 4.30 – 25 12 – 18 5.40 interesting types of play. – 34 7 – 12 6.34 – 30 1 – 7 7.45 – 40 4… 12 – 18 5.32 – 28 23 x 32 6.37 x 28 18 – 4… 13 – 18 23 7.42 – 37 23 x 32 8.37 x 28 13 – 18 etc. 4… 22 – 28 5.32 x 23 19 x 28 6.30 x 19 14 x 1.33 – 29 18 – 23 2.29 x 18 12 x 23 23 gives black a centre attack and a fascinating game may lie ahead.

5.36 – 31 18 – 23 6.32 – 27 12 – 18 If black delays the 19 – 23 x 23 3exchange 7.37 – 32 7 – 12 8.41 – 37 8 – 13 even more with 3.31 – 26 7 – 12 4.37 – 31 1 – 7 5.42 – 38 20 – 25 6.41 – 37 14 – 20 7.46 – Usually white doesn’t occupy <36> yet, not 41 10 – 14 8.47 – 42 5 – 10 9.32 – 27 etc. we finishing his fork-lock, so black gets an extra arrive at the same fork-lock position as from option playing 22 – 28 sometime, white trying the 1.32 – 28 18 – 22 opening (line 3.2). to surround black’s centre attack. 3… 7 – 12 1.33 – 28 Sijbrands-opening 3… 19 – 23 4.28 x 19 14 x 34 5.40 x 29 7 – 12 1.33 – 28 is the favorite openings move of the is also a good idea for black, leading to the famous Ton Sijbrands. same opening as 1.32 – 28 18 – 23 2.33 – 29 23 x 32 3.37 x 28 17 – 22 4.28 x 17 11 x 22 Old Dutch 5.39 – 33 13 – 18 with exchanged colors. 1.33 – 28 18 – 23 4.40 – 34 1 – 7 5.45 – 40 19 – 23 The Old Dutch opening usually leads to a 5… 20 – 25 6.42 – 38 15 – 20 7.50 – 45 10 – classical game and possibly a Highland attack. 15 An example play would be something along Another popular line is 7… 19 – 23 8.28 x 19 these lines: 2.39 – 33 12 – 18 3.44 – 39 7 – 12 14 x 23 9.32 – 28 23 x 32 10.37 x 28 20 – 24 4.31 – 27 20 – 24 5.37 – 31 14 – 20 6.41 – 37 11.29 x 20 25 x 14 etc. White can launch the Highland-attack already 8.31 – 26 playing 27 – 22 x 22 and black could reply with the symmetrical exchange 24 – 29 x 29. 6… 10 – 14 7.34 – 29 23 x 34 8.40 x 29 20 – 25 9.29 x 20 15 x 24 10.27 – 22 18 x 27 11.31 x 22 and we arrive at positions to those that arose from the 1.32 – 28 18 – 23 lines.

Modern play

1.33 – 28 18 – 22

Usually this opening leads to a modern game:

2.38 – 33 12 – 18 3.42 – 38 7 – 12 4.47 – 42 1 – 7 5.34 – 29 20 – 25 6.39 – 34 19 – 23 7.28 x The sharpest move here is 8… 16 – 21. 19 14 x 23 8.32 – 28 23 x 32 9.37 x 28 etc. 8… 5 – 10 is usually met by 9.36 – 31 but the aggressive 9.28 – 23 19 x 28 10.32 x 23 can The alternative 2.31 – 27 22 x 33 3.39 x 28 19 also be played. – 23 4.28 x 19 14 x 23 is not attractive for 9.37 – 31 11 – 16 10.31 – 27 10.41 – 37? white, since his left wing is not developed well, White should play 10.31 – 27 22 x 31 11.26x37 while piece <27> is blocking this development. 5 – 10 12.29 – 24 etc. taking a right wing attack. 2.38 – 33 12 – 18 3.34 – 29 10… 7 – 11 11.46 – 41 4 – 10! 12.47 – 42 2 – Another possibility is 3.31 – 26. Black then has 7 leads to a difficult situation for white. The also several options. The exchange 19 – 23 special move 4 – 10 is played to meet the 29 – 4.28 x 19 14 x 23 again gives white choice 24 attack. If black played 5 – 10 he would not between 32 – 28 x 28 and 34 – 29 x 29. be able to attack the outpost since the 14 – 19 attack at the outpost would then be punished 3.31 – 26 7 – 12 4.37 – 31 19 – 23 5.28 x 19 by the 31 – 27 29 – 24 27 – 22 32 x 5 kingshot. 14 x 23 6.32 – 27 leads to the so-called If white indeed takes the attack the game can Wiersma-opening, black can play either 6… 13 continue with 13.29 – 24 20 x 29 14.34 x 23 18 – 19 or the sharp 6… 23 – 28. x 29 15.33 x 24 22 x 33 16.38 x 29 19 x 30 17.35 x 24 14 – 19 18.40 – 35 19 x 30 19.35 x

24 10 – 14 20.44 – 40 14 – 19 21.40 – 35 19 2… 14 – 19 3.45 – 40 x 30 22.35 x 24 5 – 10 and white has huge problems defending his outpost (see C. Pippel 3.33 – 28 is an interesting variation leading to – Mathijssen game in appendix). modern play. A critical line is 3…17 – 22 4.28 x 17 11 x 22 5.39 – 33 10 – 14 6.43 – 39 12 – 17 6.28 x 19 14 x 23 7.32 – 28 23 x 32 7.48 – 43 6 – 11 8.45 – 40 5 – 10 9.32 – 28 23 8.37 x 28 16 – 21 9.43 – 38 x 32 10.37 x 28 8 – 12 11.41 – 37 16 – 21 12.31 – 26 20 – 24 13.29 x 20 15 x 24 14.46 – with a modern game. Black can try to get a 41 21 – 27 with a Roozenburg attack for black. Roozenburg attack. Another popular line in this opening is

5… 7 – 11 6.43 – 39 10 – 14 7.48 – 43 5 – The seagull 10 8.45 – 40 1 – 7 9.32 – 28 1.33 – 28 17 – 21 2.39 – 33 After 9.31 – 26 black should take care not to If white wants to avoid complications 2.31 – 26 fall victim to the shot 9… 12 – 17? 10.26 – 21! 20 – 24 3.26 x 17 11 x 33 4.38 x 20 15 x 24 17 x 26* 11.32 – 28 23 x 32 12.37 x 17 11 x 22 can be played. 13.29 – 24 20 x 29 14.34 x 1 W+.

2… 21 – 26 3.44 – 39 11 – 17 4.50 – 44 9… 23 x 32 10.37 x 17 11 x 22 11.41 – 37 16 – 21 12.31 – 26 21 – 27 13.37 – 31 with an Black has now several possibilities. Let’s interesting game. consider two of them:

1) 4… 6 – 11 5.31 – 27 19 – 23 3… 10 – 14 4.50 – 45 5… 1 – 6? can be strongly met by 6.28 – 23 19 4.32 – 28 23 x 32 5.37 x 28 is a frequently x 28 7.32 x 23 18 x 29 8.34 x 23 with centre played alternative. attack. 5… 17 – 21 6.27 – 22 18 x 27 7.28 – 23 19 x 4… 5 – 10 28 8.33 x 31 is not very exciting… 6.28 x 19 14 x 23 7.33 – 28 9 – 14 8.28 x 19 Chizov-opening 14 x 23 9.38 – 33 10 – 14 10.34 – 30. White will try to surround the black centre. White will Tenfold world champion Alexeï Chizhov likes not play 33 – 28 but he will try to get control to play 5.29 – 24 20 x 29 6.33 x 24 19 x 30 over <29> later. 7.34 x 25, for example: 13 – 19 8.38 – 33 8 – 13 9.42 – 38 15 – 20 10.39 – 34 2 – 8 11.44 – 2) 4… 7 – 11 5.31 – 27 39 10 – 15 12.47 – 42 White trying to get If white doesn’t want to play this line, he can pressure at black’s left wing. At 12… 20 24 he choose 5.33 – 29 20 – 24 6.29 x 20 15 x 24 plays 13.34 – 29 23 x 34 14.40 x 20 15 x 24 7.38 – 33 10 – 15 8.42 – 38 etc. 15.45 – 40 18 – 23 16.32 – 28 23 x 32 17.37 x 6 … 17 – 22 7.28 x 17 11 x 31 8.36 x 27 19 – 28 12 – 18 18.40 – 34 etc. At 12… 17 – 21 he 23 9.35 – 30 can play 13.34 – 29 23 x 34 14.39 x 30 etc. White now can’t successfully surround black’s centre, because black’s left wing is too strong. Fork-lock-variation 1 He would better try to get a Roozenburg attack 5.31 – 26 20 – 25 6.37 – 31 14 – 20 after 20 – 25 10.33 – 29 etc. 7.41 – 37 10 – 14 1.34 – 29 Fork-lock-opening The solid 7.20 – 24 8.29 x 20 25 x 14 has been 1.34 – 29 19 – 23 2.40 – 34 played many times, but we follow a more interesting line. After 2.33 – 28 23 x 34 both 3.40 x 29 and 3.39 x 30 are played. After 3.39 x 30 white will 8.46 – 41 5 – 10 9.32 – 28 23 x 32 correct the distribution of pieces quickly again 10.37 x 28 19 – 23 11.28 x 19 13 x 24 by playing 38 – 33 42 – 38 47 – 42 etc.

Black has fork-locked the opponent. From this The peacock popular theoretical position the main line is: 12.41 – 37 8 – 13 13.37 – 32 2 – 8 14.42 – 37 1.34 – 29 17 – 22 2.40 – 34 11 – 17 14 – 19 3.45 – 40 6 – 11 4.50 – 45 1 – 6 5.31 – 26 16 – 21 leads to the Keller-opening, but white can also play:

3.32 – 28 6 – 11 4.37 – 32 19 – 23 5.28 x 19 14 x 23 6.41 – 37 10 – 14

If black wants to eliminate the 7.35 – 30 move he can play 6… 13 – 19, for example 7.46 – 41 10 – 14 8.45 – 40 5 – 10 9.32 – 28 23 x 32 10.37 x 28 16 – 21 11.31 – 26 19 – 23 12.28 x 19 14 x 23 etc.

15.48 – 42 7.35 – 30 20 – 25 8.45 – 40 5 – 10

After 15.47 – 41 17 – 22 white should not play 9.40 – 35 would allow 23 – 28 32 x 23 22 – 27 16.48 – 42 10 – 14 17.32 – 28 because of 12 – 31 x 22 17 x 19 and white’s right wing will be 17! with tactical problems for white, for 18.37 – locked. Therefore white should make sure he 32 is punished by 18 – 23! 19.29 x 27 24 – 29 still has the 30 – 24 29 – 23 33 x 35 exchange 20.33 x 24 20 x 29 21.34 x 23 17 – 22 22.27 x if black takes the 23 – 28 22 – 27 exchange. 18 13 x 33 23.39 x 28 16 – 21 24.26 x 17 11 x 33 25.38 x 29 19 x 50 B+, but 16.32 – 28 10 – 9.46 – 41 14 – 19 14 17.28 x 17 12 x 21 18.26 x 17 11 x 22 19.38 At 9… 1 – 6 white plays 10.50 – 45. – 32 8 – 12 20.33 – 28 22 x 33 21.29 x 38 like in Dibman – Stokkel (1983) (see appendix). 10.40 – 35

15… 10 – 14 16.31 – 27 17 – 21 17.26 x 17 11 x 31 18.37 x 26 with an interesting fight in the fork-lock.

Fork-lock-variation 2 1.34 – 29 20 – 25 2.40 – 34 14 – 20 3.45 – 40 10 – 14

Black can take the fork-lock at once, if he wishes, playing 3… 19 – 24.

4.32 – 28 Black has to choose between playing 10 – 14 and 9 – 14 & 3 – 9. 10… 10 – 14 can be met From here there also often will emerge a fork- by 11.32 – 28 23 x 12.37 x 28 16 – 21 with an lock-position: 4… 5 – 10 can be met by the 28 interesting, modern game. The alternative is – 23 & 29 – 24 exchange, so more principal is 11.44 – 40 14 – 20 12.50 – 45 20 – 24 4… 17 – 21 after which white could take a right Black can’t take a centre attack playing 12… wing attack, by playing either 5.29 – 24 or 22 – 28? 13.33 x 22 17 x 28 because of the allow a chain-lock playing either 5.31 – 26 19 – shot 14.29 – 24! 20 x 29 15.30 – 24 29 x 20 24 6.26 x 17 11 x 22 7.28 x 17 12 x 21 or 5.37 16.34 – 30 25 x 34 17.40 x 29 23 x 34 18.32 x – 32 5 – 10 6.41 – 37 19 – 23 7.28 x 19 13 x 25 W+1. 24 8.32 – 28 21 – 26 etc. 13.29 x 20 15 x 24 and white can simply play 14.34 – 29 23 x 34 15.40 x 20 25 x 14 16.31 –

27 22 x 31 17.37 x 28 or play the more Another quite popular line is 4.31 – 26 14 – 19 complex 14.31 – 27 22 x 31 15.36 x 27. 5.40 – 35 19 x 30 6.35 x 24 10 – 14 7.24 – 20 15 x 24 8.33 – 28 22 x 33 9.38 x 20 and the If black plays 10… 9 – 14 white will try to get a future piece at <15> promises an interesting Roozenburg attack: 11.44 – 40 3 – 9 12.50 – game. 45 1 – 6 13.31 – 27 22 x 31 14.36 x 27 etc. 4… 14 – 20 5.38 – 33 10 – 14 6.32 – 28 1.34 – 29 17 – 21 After 6.42 – 38 16 – 21 7.31 – 26 11 – 16 8.37 Usually this opening will be the same as after – 31 21 – 27 9.32 x 21 16 x 27 10.41 – 37 6 – 1.32 – 28 17 – 21 2.34 – 29 21 – 26 etc. like 11 11.37 – 32 11 – 16 12.32 x 21 16 x 27 after 1.34 – 29 17 – 21 2.39 – 33 21 – 26 3.44 13.46 – 41 14 – 19 white should give up his – 39 11 – 17 4.50 – 44 6 – 11 5.32 – 28 17 – outpost at <24> to attack the outpost at <27>: 21 etc. 14.41 – 37 19 x 30 15.40 – 34 13 – 18 16.37 – 32 9 – 13 17.32 x 21 like Gantwarg – Wiersma 1.34 – 30 The French opening (1979). 1.34 – 30 20 – 25 6… 16 – 21 7.37 – 32 11 – 16 The most frequently played continuation is 8.43 – 38 6 – 11 9.31 – 27 22 x 31 2.32 – 28 25 x 34 3.39 x 30 and after 16 – 21 10.36 x 27 21 – 26 11.41 – 36 4.37 – 32 21 – 26 5.32 – 27 26 x 37 6.41 x 32 15 – 20 7.46 – 41 20 – 24 the game will continue along classical lines.

The Cheetah

2.30 – 24 19 x 30 3.25 x 24

This sharp continuation is the fastest way to get a right wing attack from the opening, which fully explains the name of this opening..

3… 18 – 22 After 11.41 – 37 1 – 6! The 17 – 22 threat This is the sharpest continuation. would force white to flee to the edge of the 3… 18 – 23 should be answered by 4.40 – 34 board with the poor 27 – 21 x 21. Therefore 4.32 – 28? 23 x 32 5.37 x 28 isn’t good for white is almost forced to play 11.41 – 36. Black black is going to attack the outpost repeatedly can choose between two sharp plans: with huge problems for white. His right wing will be demolished. 1) 11… 17 – 21 12.46 – 41 12 – 17 13.41 – 37 7 – 12 14.37 – 31 26 x 37 15.42 x 31 21 – 26 4… 14 – 20 4… 14 – 19 5.34 – 30 25 x 34 6.39 x 30 10 – 16.47 – 42 26 x 37 17.42 x 31 1 – 6 with the 14 7.30 – 25 19 x 30 8.25 x 34 gives white a idea of reducing white’s space more and more. slight advantage. Piece 35 is centralized. 2) 11… 4 – 10 12.47 – 41 5.44 – 40 20 x 29 6.33 x 24 10 – 14 7.50 – 44 14 – 20 8.32 – 28 12.46 – 41? is wrong, for after 14 – 19 13.40 – White should be aware of the shot after 9.39 – 35 19 x 30 14.35 x 24 9 – 14 15.44 – 40 14 – 33? 20 x 29 10.33 x 24 23 – 28! 11.32 x 23 12 19 16.40 – 35 19 x 30 17.35 x 24 10 – 14 – 18 12.23 x 21 16 x 27 13.31 x 22 13 – 18 18.45 – 40 26 – 31! black wins a piece, 14.22 x 13 8 x 50 B+. because 19.27 – 21 16 x 27 20.32 x 21 17 x 26 8…. 23 x 32 9.37 x 28 20 x 29 10.34 x 23 and 21.36 x 27 is met by 25 – 30 22.24 x 35 20 – there is nothing wrong with white’s centre 24 23.29 x 18 12 x 45 B+1 and 19.27 – 22 is attack. punished by 13 – 18! 20.36 x 27 18 – 23 21

4.33 – 29 89

21.28 x 10 17 x 46 22.10 – 4 46 – 28! 23.33 x 3.28 x 19 14 x 23 4.39 – 33 22 8 – 13 24.4 x 18 17 x 21 B+. This is the modern continuation. White used to 12… 26 – 31! This surprising move is based on play 4.38 – 33 with the same strategy. White the kingshot after 13.27 – 22? 13 – 19!! 14.24 wants to get an initiative at the right wing. If x 4 14 – 19 15.36 x 27 8 – 13 16.4 x 18 12 x 43 black occupies <24> white uses the power 17.48 x 39 19 – 23 18.28 x 19 17 x 48 B+. block to put pressure. Further on in the game white wants to control <29>. He will not play 13.27 – 21 16 x 27 14.32 x 21 17 x 26 15.36 x the 33 – 28 move in the early stages of the 27 14 – 19 16.40 – 35 19 x 30 17.35 x 24 9 – game, but play at the right wing. That’s why 14 18.44 – 40 14 – 19 19.40 – 35 19 x 30 this game type is called semi-classics, white 20.35 x 24 10 – 14 21.28 – 23 won’t make the game closed classical, but tries 22.45 – 40 loses a piece as we already saw, to take <29> under control, surrounding the so white has to defend piece 24 horizontally. black centre. 21… 13 – 19 22.24 x 13 8 x 28 23.33 x 22 14 – 4.38 – 33 21 – 26. 19 with advantage for black. A move like 4… 13 – 19 would allow white to free his ‘big belly’ at the left wing playing 5.37 – Ottink-variation 31 8 – 13 6.31 – 26 etc. 1.34 – 30 17 – 22 2.30 – 25 11 – 17 5.34 – 30 10 – 14 6.30 – 25 (doesn’t allow 20 3.31 – 26 6 – 11 4.37 – 31 – 24 which is actually an option for black after 4.39 – 33 10 – 14 5.34 – 30 21 – 26 6.30 – 25) Black can take a right wing attack playing 4… 6… 14 – 19 7.25 x 14 9 x 20 22 – 27 5.32 x 21 16 x 27 6.31 x 22 18 x 27 Black can also take backwards, but white then 7.41 – 37 13 – 18 or allow a fork lock after 4… gets more space for getting the right wing 1 – 6 5.32 – 27 19 – 23 6.33 – 29 23 x 34 7.40 under control. x 29 with the so-called Ottink-variation. Instead 8.35 – 30 5 – 10 9.43 – 38 of the usual 7… 13 – 19 black can play We show the critical line, white can play more sharper: 7… 20 – 24 5.29 x 20 15 x 24 8.45 – safely by 30 – 25 and then the moves 40 – 34, 40 13 – 19 9.40 – 34 19 – 23 10.34 – 29 23 x 44 – 40 and 49 – 43. 34 11.39 x 19 14 x 23 with an interesting game 9… 10 – 14 10.49 – 43 4 – 9 11.40 – 35 11 – with the fork-lock. 17 12.45 – 40 7 – 11 13.39 – 34?! 20 – 25! 14.44 – 39 14 – 20 15.33 – 29 like in Wiersma 1.31 – 27 Polish opening – J. v.d. Wal (1979).

This opening move gives black the opportunity 4… 10 – 14 5.34 – 30 to play against white’s left wing. White allows this in order to get surrounding chances Important other continuations are 5.33 – 28 against the black centre. and 5.44 – 39.

Semi-classical opening 5.33 – 28 and now 3 possibilities:

1.31 – 27 19 – 23 2.33 – 28 17 – 21 1) 4… 14 – 19 5.44 – 39 21 – 26 5… 5 – 10? is punished by the Arc shot 27 – After 2… 17 – 22 2.28 x 19 22 x 31 3.36 x 27 22! 18 x 27 38 – 33 27 x 29 37 – 31 23 x 32 34 14 x 23 4.41 – 36 11 – 17 5.46 – 41 white x 5. W+ wants to build an cannon at his left wing. 10 – White can try to trap the opponent playing 7.34 14 6.37 – 31 14 – 19 7.38 – 33 5 – 10 8.42 – – 30 5 – 10? and perform the so-called coup 38 10 – 14 9.41 – 37 6 – 11 10.47 – 41 1 – 6 Raman: 8.30 – 24!! 20 x 29 (19 x 30 28 x 19 13 11.34 – 29 23 x 34 12.39 x 30 like Sijbrands – x 24 37 – 31 26 x 28 39 – 33 28 x 39 43 x 5 J. Palmans 2008. W+) 8.27 – 22 18 x 27 9.32 x 21 23 x 32 (otherwise 39 – 34 follows) 10.38 x 27 26 x 17 1… 20 – 25 2.28 x 19 14 x 23 can potentially 11.27 – 22 17 x 28 12.39 – 33 ad lib. 13.43 x 5 lead to positions from the Russian bear (1.32 – W+. But black can make an exchange playing 28 20 – 25). 7… 26 – 31 8.37 x 26 18 – 22 9.27 x 29 19 –

24 10.30 x 19 13 x 44 11.50 x 39 16 – 21 18.19 – 13! 8 x 19 19.29 – 23 ad lib. 20.37 – 12.26 x 17 11 x 44 13.43 – 39 44 x 33 14.38 x 31 36 x 27 21.38 – 32 ad lib. 22.42 x 4 W+. 29 with a slight edge for black. Positionally more correct is 7.36 – 31 because black can’t Black can play (from the last diagram) 7 … 21 play at <17> white can play 41 – 36 at the next – 26 8.38 – 33! White is creating the crucial 33 move, always able to change after 11 – 17 with / 39 formation making 13 – 19, which would 27 – 21 developing his left wing and 12 – 17 is strengthen black’s left wing (13 – 19 8 – 13 2 – usually prohibited because of the bomb shot, 8), unattractive because of 37 – 31! 26 x 28 33 for example: 7.36 – 31 5 – 10 8.41 – 36 10 – x 24 20 x 29. Usually the game continues 14 9.34 – 30 12 – 17? 10.30 – 24! 20 x 29 something like: 8… 10 – 14 9.34 – 30 14 – 19 11.27 – 21 16 x 27 12.32 x 12 23 x 41 13.12 x 10.30 – 25 9 – 14 11.35 – 30 4 – 9 12.40 – 35 34 W+1. 11 – 17 13.43 – 38 20 – 24 14.49 – 43 etc.

2) 5… 13 – 19 In this case white’s positionally 5… 14 – 19 6.30 – 25 21 – 26 correct move is 6.36 – 31 (followed by 41 – 36) After 6… 20 – 24 white builds the power block but he can try to trap his opponent playing 6.44 playing 44 – 39 40 – 34 34 – 30 45 – 40 50 – – 39 8 – 13 7.34 – 30!? 20 – 24? 8.27 – 22! 18 45 49 – 34. x 27 9.38 – 33 27 x 29 10.39 – 34 23 x 32 11.34 x 23 19 x 28 12.30 x 26 winning the 7.25 x 14 9 x 20 piece at <32>. 7… 19 x 10 isn’t bad, but white gets more 3) 5… 5 – 10 6.28 x 19 14 x 23 7.44 – 39 space at the right wing.

8.35 – 30 5 – 10 9.30 – 25 10 – 14 10.44 – 39 4 – 9 11.40 – 34 20 – 24

Another logical line is 11… 11 – 17 12.45 – 40 7 – 11 13.50 – 45 17 – 21 14.34 – 30 20 – 24 15.40 – 35 11 – 17 16.49 – 44 etc.

12.45 – 40 11 – 17 13.50 – 45 14 – 20 14.25 x 14 9 x 20

Black has to dodge a famous trap, that has made countless victims already: the coup Lochtenberg: 7… 10 – 14? 8.27 – 22! 18 x 27 9.36 – 31 27 x 36 10.32 – 27 21 x 32 11.37 x 10 9 – 14 12.10 x 19 13 x 24 13.34 – 30 3 – 9 14.30 x 19 4 – 10 14… 9 – 13 15.40 – 34 13 x 24 16.34 – 30 4 – 9 17.30 x 19 9 – 13 18.39 – 34 13 x 24 19.34 – 30 24 – 29 20.30 – 25 20 – 24 21.25 – 20 8 – 13 22.38 – 33 29 x 38 23.20 x 29 W+1. Black tries to get control over <24> but 15.40 – 15.35 – 30! 35 can lead to a fierce fight, like in the Preventing 9 – 14 while 20 – 24 is met by the Hoogendoorn – W. van der Kooij game in stick move 20 – 14 W+. which white managed to get control over <29> 15… 20 – 25 16.41 – 37 25 x 34 17.40 x 29 12 later anyhow! – 18 Black tries to get back the lost piece, at 17… Left-wing-opening 15 – 20 there is a similar shot beginning with 29 – 24 & 19 – 14. 1.31 – 27 17 – 21

White can play the simple 2.37 – 31 21 – 26 have overlooked the simple shot after 12… 13 3.32 – 28 26 x 37 4.41 x 32 developing his left – 18? 13.28 – 22! 17 x 28 14.33 x 13 9 x 18 wing. 2.37 – 31 19 – 23 3.31 – 26 is also 15.27 – 22 18 x 27 16.32 x 21 16 x 27 17.35 – possible, but quite boring after 20 – 24 26 x 17 30 24 x 33 18.38 x 16 winning piece <27>. 11 x 31 36 x 27 24 – 29 33 x 24 23 – 28 32 x Usually black plays 12… 20 – 25. 23 18 x 20 =, but 3.41 – 37 21 – 26 4.33 – 28 11 – 17 5.28 x 19 14 x 23 6.27 – 21 16 x 27 31 3… 10 – 14 4.46 – 41 5 – 10 x 11 6 x 17 isn’t exciting either. 5.31 – 27 20 – 24 6.36 – 31 15 – 20 7.33 – 28 10 – 15 8.41 – 36 4 – 10 Playing 2.33 – 28 can lead to the same varition 9.47 – 41 17 – 21 10.26 x 17 11 x 33 as before, but if black plays 21 – 26 3.39 – 33 11.39 x 28 23 – 29 12.34 x 23 18 x 29 11 – 17 4.44 – 39 17 – 22 5.28 x 17 12 x 21 instead of 19 – 23 x 23, it’s harder for white to 13.27 – 21 16 x 27 14.31 x 22 6 – 11 leads to get a good surrounding play, as we already an exciting game as in Valneris – Chizhov saw in the 1.33 – 28 17 – 21 Seagull opening. (2001). Of course there are many more 6.33 – 28 7 – 12 7.50 – 44 1 – 7 8.38 – 33 7 – variations in this opening, but we showed one 11 of the most interesting ones. If black changes 19 – 23 x 23 white frees his left wing by 32 – 28 23 x 32 27 x 38. When playing this opening with black, you 9.43 – 38 19 – 23 10.28 x 19 14 x 23 11.33 – have to take care for the trap called the 28 9 – 14 12.28 x 19 14 x 23 13.38 – 33 10 – Mountain shot after 1.31 – 26 19 – 23 2.37 – 14 14.32 – 28 23 x 32 15.27 x 38 20 – 24 white 31 14 – 19 3.33 – 29 (this move can also be trailing 8 temps, giving black the initiative. played later on) 10 – 14 4.41 – 37 5 – 10 5.46 – 41 20 – 25 6.39 – 33 The big leap

1.31 – 27 17 – 22

White can play many moves like 2.37 – 31 19 – 23 3.31 – 26 22 x 31 4.26 x 37 or 2.32 – 28 22 x 31 3.36 x 27. However, the most exciting continuation is:

2.36 – 31 22 – 28

2… 19 – 23 3.34 – 29 23 x 34 4.40 x 29 14 – 19 5.32 – 28 is very solid. 6… 14 – 20? 7.26 – 21!! 17 x 26 8.32 – 28 23 x 3.32 x 23 19 x 28 4.33 x 22 16 – 21 32 9.37 x 28 26 x 46 10.29 – 23 18 x 29 11.34 5.27 x 16 18 x 36 x 5 and black’s king is caught or 7.26 – 21 16 x 27 8.32 x 21 17 x 26 9.33 – 28 23 x 32 10.37 x White can also take 2.33 x 22 16- 21 3.27 x 16 28 26 x 46 11.29 – 23 18 x 29 12.34 x 5 with 18 x 36. In both cases the piece at <36> the same result. promises an interesting fight. Black can play 6… 15 – 20 7.44 – 39 10 – 15 8.50 – 44 4 – 10 9.32 – 28 23 x 32 10.37 x 28 The edge-opening 19 – 23 11.28 x 19 13 x 24 with the fork-lock 1.31 – 26 19 – 23 2.36 – 31 14 – 19 position from 1.34 – 29 19 – 23. 3.41 – 36 Rejected edge-opening Another popular line is 3.33 – 28 20 – 24 4.39 – 33 10 – 14 5.44 – 39 14 – 20 6.41 – 36 5 – 1.31 – 26 17 – 21 2.26 x 17 11 x 22 10 7.46 – 41 10 – 14 8.34 – 29 23 x 34 9.40 x 29 18 – 23 10.29 x 18 12 x 23 11.31 – 27 7 – 12 12.45 – 40. In this position many players

This opening usually transposes to 1.32 – 28 8.47 – 41 21 – 26 9.39 – 33 and black can opt 17 – 22 2.28 x 17 11 x 22 3.37 – 32. If white for either 9… 17 – 22 or the continuation plays 3.37 – 31 we arrive at the same position. Sijbrands chose against Cordier: 9… 15 – 20 10.44 – 39 19 – 24 11.30 x 19 13 x 24 12.49 – 44 9 – 13 13.35 – 30 24 x 35 14.29 – 23 18 x Of course black can play all moves, of which 29 15.33 x 15 with an exciting game with the 1.31 – 26 18 – 23 is a frequently played one, edge piece at <15> (see appendix). but we will not elaborate on this possibilities here. 6.43 – 38

1.35 – 30 The wild horse 6.42 – 38? is punished by 19 – 24! 7.29 x 20 22 – 28 8.32 x 23 18 x 29 9.34 x 23 25 x 45 The sharpest of opening moves is 1.35 – 30. It and piece 23 will be shelled. ois also the rarest opening move, but can lead to exciting games! 6… 11 – 17 7.38 – 33 6 – 11

1.35 – 30 20 – 25 2.40 – 35 White can now choose between 8.32 – 28 and the immediate 8.30 – 24 19 x 30 9.35 x 24 both 2.33 – 29 15 – 20 3.29 – 23 white taking an leading to a quick right wing attack. early centre attack is called the Agafonov- opening.

2… 15 – 20 3.45 – 40 20 – 24

3… 17 – 22 is a good move too, after 4.32 – 28 20 – 24 etc. white plays with a locked right wing, like in a Schwarzman – Chizhov world championship match.

4.33 – 29 24 x 33 5.38 x 29

Opening ceremony of a Chinese draughts event

Epilogue

Many openings can be studied much deeper. If you want to do this it is very helpful to have the games database called Turbo Dambase,

produced by Klaas Bor. This database 5… 17 – 22 contains some 300,000 games.

5… 10 – 15 6.50 – 45 5 – 10 7.42 – 38 16 – 21! is also a popular line. 8.31 – 26 isn’t attractive now, because of 17 – 22 26 x 28 18 – 23 29 x 18 13 x 31 36 x 27 15

– 20 and white is getting locked. At 8.39 – 33 black plays 21 – 27 9.32 x 21 17 x 26. White can choose to play 8.38 – 33 21 – 27 9.31 x 22 18 x 38 10.43 x 32 or 10.33 x 42 like Georgiev played against Schwarzman in 2003.

Appendix openings

1.32 – 28 19 – 23

Roozenburg-variation

Wiersma – Kuyken 1973 (2-0) 1.32-28 19-23 2.28x19 14x23 3.37-32 10-14 4.35-30 20-25 5.33-29 5-10 6.40-35 14-19 7.41-37 10-14 8.46-41 17-22 9.31-27 22x31 10.36x27 11-17 11.45-40 6-11 12.30-24 19x30 13.35x24 14-20 14.38-33 17-21 15.42-38 21-26 16.41-36 11-17 17.48-42 1- 6 18.50-45 4-10 19.33-28 9-14 20.28x19 14x23 21.38-33 6-11 22.36-31 10-14 23.43-38 14-19 24.40-35 19x30 25.35x24 17-21 26.33-28 12-17 27.28x19 18-23 28.29x 9 20x40 29.45x34 3x23 30.47-41 7-12 31.49-43 8-13 32.39-33 12-18 33.44-40 13-19 34.33-28 18-22 35.27x29 21-27 36.32x12 11-17 37.12x21 16x47 38.29-23 19-24 39.28-22 24-30 40.34-29 30-34 41.22-17 34x45 42.17-11 47-36 43.11- 6 2- 7 44.38-33 45-50 45.43-39 50-45 46.42-38 7-11 47. 6x17 15-20 48.17-12 20-24 49.29x20 45x 7 50.20-14 7-23

Drost-variation

Wiersma - Georgiev 1995 (2-0) 1.32-28 19-23 2.28x19 14x23 3.37-32 10-14 4.41-37 5-10 5.46-41 14-19 6.35-30 20-25 7.33-29 17-22 8.40-35 11-17 9.31-27 22x31 10.36x27 6-11 11.45-40 17-21 12.38-33 11-17 13.30-24 19x30 14.35x24 21-26 15.43-38 17-21 16.41-36 12-17 17.33-28 7-12 18.28x19 17-22 19.40-35 22x31 20.36x27 12-17 21.27-22 18x27 22.29-23 27-31 23.39-33 17-22 24.32-28 13-18 25.23x12 8x17 26.49-43 31-36 27.44-39 21-27 28.28-23 27-31 29.50-44 17-21 30.34-30 25x34 31.39x30 9-14 32.30-25 2- 8 33.44-39 4- 9 34.39-34 9-13 35.34-30 3- 9 36.38-32 1- 6 37.43-38 6-11 38.48-43 11-17 39.43-39 22-27 40.39-34 8-12 41.19x 8 12x 3 42.23-18 17-22 43.34-29 22x13 44.29-23 3- 8 45.33-28 8-12 46.23-19 14x23 47.28x17 21x12 48.32x21 16x27 49.47-41 36x47 50.38-33 47x20 51.25x 3 31x42 52. 3x47 26-31 53.30-24 31-37 54.35-30 10-14 55.30-25 15-20 56.24x15 14-19 57.25-20 19-23 58.15-10

Springer Contra Attaque

Traoré - Gantwarg 1980 (0–2) 1.32-28 19-23 2.28x19 14x23 3.37-32 10-14 4.41-37 14-19 5.46-41 5-10 6.35-30 20-25 7.33-29 10-14 8.40-35 17-22 9.31-27 22x31 10.36x27 23-28 11.32x23 19x28 12.38-32 13-19 13.32x23 19x28 14.41-36 8-13 15.37-31 18-22 16.27x18 13x22 17.39-33 28x39 18.44x33 4-10 19.42-38 11-17 20.38-32 6-11 21.32-28 16-21 22.47-42 12-18 23.43-38 9-13 24.45-40 22-27 25.31x22 18x27 26.42-37 7-12 27.50-44 21-26 28.48-43 17-21 29.44-39 11-16 30.38-32 27x38 31.33x42 1- 7 32.42-38 13-18 33.39-33 2- 8 34.28-23 18-22 35.38-32 14-20 36.43-38 7-11 37.32-28 11-17 38.38-32 22-27 39.49-44 27x38 40.33x42 10-14 41.36-31 8-13 42.42-38 14-19 43.23x14 20x 9 44.38-32 12-18 45.30-24 18-22 46.28-23 22-28 47.23-19 28-33 48.19x 8 3x12 49.29x38 17-22 50.44-39 21-27 51.32x21 16x36 52.38-32 22-27 53.32x21 26x17 54.39-33 17-22 55.34-29 22-27 56.29-23 27-31 57.37x26 36-41 58.40-34 41-47 59.33-29 12-17 60.26-21 17x26 61.23-18 9-14 62.29-23 47x20 63.34-30 25x34 64.18-13 20-24 65.23-19 14x23 66.13- 9 34-39 67. 9- 3 39-43 68. 3-14

Chizhov-exchange

Chizhov - Wesselink 1987 (2-0) 1.32-28 19-23 2.28x19 14x23 3.37-32 10-14 4.41-37 5-10 5.34-29 23x34 6.39x30 14-19 7.44-39 10-14 8.40-34 18-23 9.45-40 12-18 10.46-41 7-12 11.32-28 23x32 12.37x28 17-22 13.28x17 11x22 14.50-45 1- 7 15.30-25 16-21 16.31-26 21-27 17.34-30 19-23 18.33-29 23x34 19.40x29 4-10 20.41-37 27-31 21.36x27 22x31 22.38-33 31-36 23.42-38 20-24 24.30x19 14x34 25.39x30 10-14 26.49-44 18-23 27.37-32 13-19 28.44-40 14-20 29.25x14 9x20 30.43-39 8-13 31.40-34 2- 8 32.48-43 13-18 33.33-29 20-25 34.30-24 19x30 35.35x24 12-17 36.39-33 3- 9 37.32-27 18-22 38.29x18 22x13 39.38-32 13-18 40.45-40 17-22 41.34-29 22x31 42.26x37 6-11 43.33-28 11-17 44.43-38 8-12 45.28-23 17-21 46.32-28 7-11 47.37-31 36x27 48.28-22 9-13 49.22x31 21-27 50.31x22 18x27 51.38-33 27-32 52.40-34 11-17 53.47-41 25-30 54.34x25 17-21 55.41-36 32-37 56.23-19 13-18 57.36-31 37x26 58.19-14 26-31 59.14- 9 31-36 60. 9- 3 21-26 61. 3x17 36-41 62.17-28 41-47 63.28-32 47-36 64.33-28 36-31 65.28-23 18-22 66.23-19 22-27 67.32x16 31-37 68.29-23 26-31 69.16-32 37x28 70.23x32 31-36 71.19-13 36-41 72.13- 8 41-46 73.32-27 46-28 74. 8- 2 28-41 75.27-21 41-23 76.21-17

Chizhov - Berçot 2002 (2-0) 1.32-28 19-23 2.28x19 14x23 3.37-32 10-14 4.41-37 5-10 5.34-29 23x34 6.39x30 14-19 7.44-39 10-14 8.40-34 18-23 9.46-41 12-18 10.32-28 23x32 11.37x28 7-12 12.41-37 1- 7 13.45-40 17-21 14.50-45 21-26 15.38-32 18-23 16.30-25 20-24 17.34-29 23x34 18.40x20 15x24 19.39-34 4-10 20.43-39 12-18 21.49-44 18-23 22.44-40 7-12 23.34-30 11-17 24.31-27 17-21 25.39-34 10-15 26.42-38 12-18 27.47-42 6-11 28.34-29 23x34 29.40x20 15x24 30.27-22 18x27 31.45-40 27-31 32.36x27 13-18 33.28-23 19x39 34.30x10 18-22 35.27x18 9-13 36.18x 9 3x 5 37.40-34 39x30 38.35x24 8-13 39.25-20 21-27 40.32x21 16x27 41.38-33 11-17 42.20-14 2- 8 43.42-38 17-21 44.48-43 27-31 45.24-19 31x42 46.38x47 13x24 47.14- 9 8-13 48. 9x18 26-31 49.18-12 31-37 50.12- 7 24-30 51.43-39 5-10 52. 7- 2 30-35 53.39-34 10-14 54.34-30 35x24 55. 2x30 21-26 56.30-48

Groninger variation

Greveraars - Thijssen 1997 (0–2) 1.32-28 19-23 2.28x19 14x23 3.37-32 10-14 4.41-37 5-10 5.46-41 14-19 6.32-28 23x32 7.37x28 9-14 8.41-37 16-21 9.31-26 18-22 10.38-32 11-16 11.43-38 3- 9 12.48-43 7-11 13.34-29 20-24 14.29x20 15x24 15.40-34 21-27 16.32x21 16x27 17.37-32 11-16 18.32x21 16x27 19.34-30 13-18 20.30-25 1- 7 21.45-40 18-23 22.50-45 23x32 23.33-29 24x33 24.39x37 6-11 25.37-32 11-16 26.32x21 16x27 27.42-37 7-11 28.47-41 2- 7 29.37-32 11-16 30.32x21 16x27 31.41-37 7-11 32.44-39 12-18 33.37-31 19-24 34.38-32 27x38 35.43x32 9-13 36.32-27 14-19 37.40-34 19-23 38.34-30 23-28 39.30x19 13x24 40.27-21 8-12 41.21-16 28-32 42.16x 7 12x 1 43.49-43 22-28 44.45-40 18-23 45.40-34 10-14 46.31-27 32x21 47.36-31 24-29 48.43-38 29x40 49.35x44 23-29 50.44-40 17-22 51.26x17 22x11 52.40-35 11-16

1.32 – 28 18 – 23 Chefneux

The Fox

A. Chizhov – A. Shwarzman 1998 (1-1) 1.32-28 18-23 2.33-29 23x32 3.37x28 20-25 4.41-37 12-18 5.37-32 16-21 6.29-24 19x30 7.35x24 11-16 8.39-33 7-12 9.44-39 14-20 10.50-44 20x29 11.33x24 10-14 12.46-41 1- 7 13.41-37 14-19 14.40-35 19x30 15.35x24 9-14 16.39-33 3- 9 17.43-39 5-10 18.31-26 18-22 19.48-43 21-27 20.32x21 16x27 21.37-32 14-20 22.32x21 20x40 23.45x34 10-14 24.28-23 22-28 25.33x11 7x27 26.42-37 6-11 27.44-40 12-17 28.37-32 8-12 29.32x21 11-16 30.47-42 16x27 31.42-37 2- 7 32.37-32 13-19 33.32x21 19x28 34.38-33 17-22 35.36-31 9-13 36.33-29 4- 9 37.49-44 13-18 38.29-24 18-23 39.34-29 23x45 40.24-20 15x24 41.44-40 45x34 42.39x10 9-14 43.10x19 25-30 44.19-14 30-34 45.14- 9 34-40 46. 9- 4 7-11 47. 4x27 11-16

E. Holstvoogd – T. Sijbrands 1973 (0-2) 1.32-28 18-23 2.33-29 23x32 3.37x28 20-25 4.41-37 17-21 5.37-32 15-20 6.39-33 19-24 7.44-39 21-26 8.50-44 26x37 9.42x31 14-19 10.46-41 10-14 11.41-37 11-17 12.47-42 6-11 13.28-23 19x28 14.32x23 5-10 15.31-26 16-21 16.38-32 11-16 17.42-38 21-27 18.32x21 16x27 19.48-42 1- 6 20.37-32 6-11 21.32x21 11-16 22.34-30 25x34 23.39x19 16x27 24.40-34 13x24 25.34-30 9-13 26.30x19 13x24 27.44-39 4- 9 28.45-40 27-32 29.38x27 17-22 30.27x18 24-30 31.35x13 8x28 32.33x22 12x45 33.43-38 45-50 34.38-33 50-45 35.42-38 45-23 36.36-31 23-41 37.26-21 41-36 38.31-27 7-12

T. van Bokhoven – T. Sijbrands 1977 (0-2) 1.32-28 18-23 2.33-29 23x32 3.37x28 20-25 4.39-33 15-20 5.41-37 19-24 6.46-41 14-19 7.37-32 17-21 8.41-37 21-26 9.44-39 16-21 10.50-44 10-14 11.31-27 11-16 12.29-23 5-10 13.34-29 7-11 14.40-34 12-17 15.27-22 8-12 16.37-31 26x37 17.32x41 3- 8 18.41-37 1- 7 19.38-32 13-18 20.22x13 9x18 21.43-38 21-27 22.32x21 17x26 23.45-40 16-21 24.49-43 8-13 25.37-32 2- 8 26.42-37 21-27 27.32x21 26x17 28.38-32 24-30 29.35x15 19-24 30.29x 9 18x27 31. 9x18 12x41

Highland-opening

A. Bajakin – N. Mogiljanski 1987 (0-2) 1.32-28 18-23 2.38-32 12-18 3.31-27 7-12 4.36-31 20-24 5.43-38 14-20 6.49-43 10-14 7.41-36 5-10 8.46-41 1- 7 9.34-29 23x34 10.40x29 20-25 11.29x20 15x24 12.27-22 18x27 13.31x22 16-21 14.45-40 21-26 15.40-34 17-21 16.36-31 11-16 17.31-27 12-18 18.44-40 18-23 19.50-45 24-30 20.35x24 19x30 21.28x19 14x23 22.34-29 23x34 23.40x29 7-11 24.41-36 10-14 25.36-31 14-19 26.47-41 19-24 27.29x20 25x14 28.33-29 13-19 29.39-34 30x39 30.43x34 11-17 31.22x11 6x17 32.41-36 2- 7 33.27-22 17x28 34.32x23 19x28 35.38-32 8-13 36.32x23 13-19 37.42-38 19x28 38.38-32 9-13 39.32x23 13-19 40.23-18 4- 9 41.34-30 14-20 42.18-13 19x 8 43.48-43 7-12 44.30-24 20-25 45.29-23 9-13 46.45-40 12-18 47.23x12 8x17 48.43-39 17-22 49.39-33 3- 9 50.33-29 22-28 51.40-34 9-14 52.24-20 13-19 53.20x 9 19-24 54.29x20 25x 3

F. de Koning – K. Thijssen 2010 (0-2) 1.33-28 18-23 2.39-33 12-18 3.44-39 7-12 4.31-27 20-24 5.37-31 14-20 6.41-37 10-14 7.34-29 23x34 8.40x29 20-25 9.29x20 15x24 10.49-44 5-10 11.44-40 10-15 12.40-34 1- 7 13.27-22 18x27 14.31x22 14-20 15.45-40 16-21 16.46-41 21-26 17.36-31 17-21 18.41-36 11-16 19.31-27 7-11 20.50-45 24-30 21.35x24 19x30 22.36-31 12-17 23.33-29 30-35 24.38-33 35x44 25.39x50 13-18 26.22x13 9x18 27.45-40 17-22 28.28x17 11x22 29.43-38 20-24 30.29x20 25x14 31.33-28 22x33 32.38x29 14-19 33.50-44 6-11 34.44-39 8-13 35.47-41 11-17 36.41-36 19-23 37.40-35 15-20 38.39-33 17-22 39.35-30 13-19 40.42-38 4- 9 41.48-43 9-14 42.30-25 19-24 43.43-39 24-30 44.29-24 20x40 45.25x45 23-28 46.32x12 21x34

1.32 – 28 17 – 22 x 22 Chogoliev-opening

H. Wiersma – W. Chogoliev 1976 (2-0) 1.32-28 17-22 2.28x17 11x22 3.37-32 12-17 4.41-37 6-11 5.46-41 8-12 6.32-28 16-21 7.31-26 21-27 8.35-30 2- 8 9.30-25 27-31 10.36x27 22x31 11.34-29 31-36 12.37-32 1- 6 13.40-34 19-23 14.28x19 14x23 15.25x14 10x19 16.45-40 5-10 17.29-24 19x30 18.34x25 10-14 19.39-34 13-19 20.50-45 17-21 21.26x17 11x22 22.44-39 8-13 23.34-29 23x34 24.39x30 6-11 25.32-28 11-17 26.40-34 3- 8 27.34-29 4-10 28.29-23 18x29 29.33x24 22x33 30.38x29 19-23 31.29x18 13x22 32.41-37 9-13 33.42-38 12-18 34.38-33 8-12 35.33-29 22-28 36.43-38 28-33 37.38-32 33-39 38.32-28 7-11 39.28-23 18-22 40.49-43 13-18 41.43x34 11-16 42.45-40 16-21 43.40-35 21-26 44.24-19 22-28 45.23x32 14x23 46.47-41 36x47 47.32-27 47x24 48.30x28 17-21 49.27x16 12-17 50.34-29 10-14 51.35-30 15-20 52.28-23 18-22 53.30-24

Chizhov-attack

A. Georgiev – A. Chizhov 2003 (2-0) 1.32-28 17-22 2.28x17 11x22 3.37-32 6-11 4.41-37 12-17 5.46-41 8-12 6.32-28 16-21 7.31-26 21-27 8.35-30 2- 8 9.30-25 1- 6 10.37-31 19-23 11.28x19 14x23 12.25x14 10x19 13.34-30 5-10 14.30-25 23-28 15.41-37 10-14 16.40-34 19-24 17.45-40 14-20 18.25x14 9x20 19.40-35 3- 9 20.34-30 18-23 21.30x19 23x14 22.35-30 13-19 23.30-25 19-24 24.50-45 9-13 25.45-40 13-19 26.40-34 4- 9 27.34-29 27-32 28.38x18 12x34 29.33x22 17x28 30.39x30 24x35 31.42-38 20-24 32.48-42 8-12 33.43-39 11-17 34.31-27 6-11 35.36-31 24-29 36.27-22 28-33 37.39x28 29-34 38.31-27 34-40 39.27-21 40-45 40.37-31 19-24 41.44-40 45x34 42.38-33 35-40 43.22-18 12x32 44.21x 1 32-37 45.49-43 37x28 46. 1- 6 24-29 47. 6x35 29-33 48.31-27 9-13 49.35x 2 33-38 50. 2-30 34-40 51.30-35 40-45 52.35-49 38-42 53.47x38 45-50 54.38-32 50-33 55.27-21 33- 6 56.32-27 6-33 57.21-16

1.32 – 28 17 – 22 x 21 Schwarzman manoeuvring opening

A. Shwarzman – A. Chizhov 2003 (0-2) 1.32-28 17-22 2.28x17 12x21 3.31-26 7-12 4.26x17 12x21 5.37-31 2- 7 6.31-27 21x32 7.38x27 11-17 8.43-38 19-23 9.49-43 17-21 10.36-31 21x32 11.38x27 23-28 12.33x22 16-21 13.27x16 18x36 14.41-37 14-19 15.39-33 10-14 16.46-41 19-23 17.37-32 14-19 18.41-37 13-18 19.32-27 5-10 20.37-32 10-14 21.44-39 9-13 22.43-38 4- 9 23.33-28 6-11 24.34-30 11-17 25.40-34 20-24 26.30-25 24-29 27.42-37 29x40 28.35x44 17-21 29.44-40 15-20 30.40-35 20-24 31.45-40 14-20 32.25x14 9x20 33.50-45 20-25 34.48-43 3- 9 35.39-33 24-30 36.35x24 19x30 37.28x19 13x24 38.33-28 18-23 39.28x19 24x13 40.43-39 8-12 41.37-31 12-18 42.40-34 18-23 43.31-26 23-28 44.26x17 28x37 45.38-32 37x28 46.34-29 30-35 47.29-24 1- 6 48.27-22 25-30 49.22x33 30x19 50.33-28 7-12 51.17x 8 13x 2 52.39-33 19-23

E. Prosman – A. Shwarzman 2004 (1-1) 1.32-28 17-22 2.28x17 12x21 3.35-30 20-25 4.40-35 15-20 5.45-40 20-24 6.33-29 24x33 7.39x28 11-17 8.44-39 18-22 9.49-44 22x33 10.39x28 13-18 11.44-39 18-22 12.38-33 14-20 13.42-38 20-24 14.50-45 7-12 15.37-32 10-14 16.41-37 24-29 17.33x13 22x44 18.40x49 9x18 19.32-28 1- 7 20.38-33 5-10 21.37-32 7-11 22.43-38 3- 9 23.49-43 9-13 24.30-24 18-23 25.28x19 14x23 26.31-27 21-26 27.47-42 4- 9 28.43-39 17-21 29.46-41 12-18 30.41-37 8-12 31.27-22 18x27 32.33-28 2- 8 33.28x19 9-14 34.39-33 14x23 35.33-28 11-17 36.28x19 17-22 37.48-43 12-17 38.36-31 27x36 39.32-27 21x41 40.42-37 41x32 41.38x 9 36-41 42. 9- 4 41-46 43. 4x15 46x 5 44.43-38 26-31 45.24-19 5x30 46.35x24 31-37 47.24-19 37-41 48.19-14 41-47 49.14-10 8-13 50.45-40 13-19 51.40-34 19-24 52.15x11 6x17 53.10- 5 17-21 54. 5-37 21-26 55.37-48 47-24 56.48-37 24-35 57.34-29 35-13 58.37-32 26-31 59.32-28 31-36 60.28-37 13- 8 61.37-28 8-30 62.28-32 30-13 63.32-37 13- 8 64.37-28 16-21 65.28-32 21-26 66.32-28 8-13 67.28-37 13-35 68.37-28 35-13 69.28-32 13- 2 70.32-28 2-13 71.28-32 13-22 72.29-24 22-33 73.24-19 33-22 74.19-14 22- 4 75.32-19 26-31 76.19-32 25-30 77.32-43 30-35 78.43-48 36-41 79.48x26 41-46

A. Shwarzman – A. Chizhov 1998 (1-1) 1.32-28 17-22 2.28x17 12x21 3.34-30 7-12 4.30-25 11-17 5.31-26 6-11 6.40-34 19-23 7.35-30 1- 6 8.45-40 13-19 9.40-35 9-13 10.44-40 4- 9 11.50-45 2- 7 12.37-31 18-22 13.31-27 22x31 14.26x37 17-22 15.33-29 12-18 16.39-33 7-12 17.37-31 21-27 18.31-26 11-17 19.49-44 23-28 20.44-39 19-24 21.30x19 14x23 22.25x14 9x20 23.29-24 20x29 24.33x24 10-14 25.38-33 17-21 26.26x17 12x21 27.42-38 8-12 28.35-30 14-20 29.30-25 20x29 30.33x24 13-19 31.24x13 18x 9 32.41-37 12-18 33.37-31 21-26 34.47-42 26x37 35.42x31 5-10 36.34-29 23x34 37.40x29 16-21 38.39-33 28x39 39.43x34 9-14 40.31-26 22-28 41.26x17 18-22 42.29-23 28x19 43.17x28 19-23 44.28x19 14x23 45.46-41 6-11 46.41-37 11-17 47.37-32 17-21 48.48-42 10-14 49.42-37 15-20 50.34-30 21-26 51.32x21 26x17 52.37-32 3- 8 53.38-33 8-13 54.45-40 17-21 55.40-34 13-19 56.34-29 23x34 57.30x39 19-23 58.33-28 23-29 59.28-22 20-24 60.22-18 14-20 61.25x14 24-30 62.14- 9 29-34 63.39-33 34-40 64. 9- 3 40-44 65. 3x26 30-34 66.32-28 44-49 67.26-48 34-40 68.48-39 49-21 69.18-13 21-26 70.33-29 26-17

1.32 – 28 18 – 22 The eagle

Mutual-outposts-variation

A. Gantwarg – H. Wiersma 1979 (1-1) 1.32-28 18-22 2.37-32 12-18 3.41-37 7-12 4.46-41 1- 7 5.34-29 19-23 6.28x19 14x34 7.40x29 10-14 8.35-30 20-25 9.30-24 5-10 10.44-40 14-20 11.50-44 9-14 12.32-28 16-21 13.31-26 11-16 14.37-32 21-27 15.32x21 16x27 16.38-32 27x38 17.43x32 14-19 18.40-35 19x30 19.35x24 17-21 20.26x17 22x11 21.42-38 10-14 22.44-40 18-22 23.28x17 11x22 24.41-37 4-10 25.49-44 3- 9 26.47-42 14-19 27.40-35 19x30 28.35x24 10-14 29.45-40 14-19 30.40-35 19x30 31.35x24 9-14 32.44-40 6-11 33.32-28 11-17 34.37-32 14-19 35.40-35 19x30 36.35x24 13-19 37.24x13 8x19 38.29-23 20-24 39.23x14 24-29 40.33x24 22x44 41.14- 9 44-50 42.24-19 25-30 43. 9- 4 17-21 44.19-14 30-35 45. 4-31 35-40 46.14- 9 40-45 47. 9- 4 50- 6 48.31-37 45-50 49.37-46 50-11 50.42-37 6- 1 51.37-31 11- 6 52.31-27 15-20 53.27x16 20-25 54. 4-31 7-11 55.16x18

Mutual outposts variation

L. Thijssen - B. Terwel 1996 (0-2) 1.34-29 17-22 2.32-28 11-17 3.37-32 6-11 4.41-37 1- 6 5.46-41 19-23 6.28x19 14x34 7.40x29 10-14 8.35-30 20-25 9.30-24 14-20 10.44-40 9-14 11.50-44 5-10 12.32-28 16-21 13.31-26 11-16 14.37-32 21-27 15.32x21 16x27 16.38-32 27x38 17.43x32 4- 9 18.42-38 22-27 19.32x21 25-30 20.24x35 18-23 21.29x18 12x34 22.21x 1 20-25 23.40x29 13-18 24. 1x23 25-30 25.35x24 15-20 26.24x13 8x50 27.41-37 2- 8 28.48-43 50-11 29.43-38 8-12 30.49-43 11- 7 31.45-40 6-11 32.40-35 12-18 33.35-30 11-17 34.29-24 3- 8 35.24-19 14x23 36.30-25 23-29 37.25-20 17-21 38.26x17 8-12 39.17x 8 29-33 40.38x29

The black rush

A. Gantwarg – V. Wirny 1983 (0-2) 1.32-28 18-22 2.37-32 12-18 3.41-37 7-12 4.46-41 1- 7 5.34-30 20-25 6.30-24 19x30 7.35x24 14-20 8.33-29 22x33 9.39x28 17-21 10.29-23 20x29 11.23x34 21-26 12.38-33 10-14 13.44-39 11-17 14.42-38 17-22 15.28x17 12x21 16.47-42 5-10 17.31-27 7-12 18.49-44 15-20 19.33-28 10-15 20.39-33 14-19 21.44-39 19-23 22.28x19 13x24 23.36-31 9-13 24.50-44 4- 9 25.41-36 2- 7 26.33-29 24x33 27.39x28 18-23 28.28x19 13x24 29.38-33 8-13 30.33-28 13-19 31.42-38 9-13 32.38-33 24-30 33.44-39 12-18 34.33-29 7-12 35.29-23 18x29 36.34x14 20x 9 37.40-34 13-19 38.43-38 9-13 39.45-40 3- 9 40.38-33 9-14 41.48-42 30-35 42.34-29 35x44 43.39x50 14-20 44.29-23 6-11 45.23x14 20x 9 46.33-29 15-20 47.42-38 20-24 48.29x20 25x14 49.38-33 14-19 50.50-44 12-18 51.44-39 19-24 52.28-22 18-23 53.39-34 13-19 54.22-17 21x12 55.27-22 11-17 56.22x11 16x 7 57.31-27 9-13 58.33-28 12-18 59.36-31 7-11 60.28-22 24-30

T. Sijbrands – J. de Jonge 1991 (2-0) 1.32-28 18-22 2.37-32 12-18 3.41-37 7-12 4.46-41 1- 7 5.34-30 20-25 6.30-24 19x30 7.35x24 14-20 8.33-29 22x33 9.39x28 18-22 10.38-33 10-14 11.42-38 16-21 12.31-26 11-16 13.44-39 14-19 14.40-35 19x30 15.35x24 7-11 16.39-34 9-14 17.43-39 14-19 18.28-23 19x28 19.32x23 13-19 20.23x14 20x 9 21.48-43 8-13 22.37-32 13-18 23.32-28 21-27 24.45-40 3- 8 25.40-35 9-13 26.28-23 4-10 27.50-44 13-19 28.23x14 10x30 29.35x24 2- 7 30.47-42 18-23 31.29x18 22x13 32.33-28 17-22 33.28x17 12x21 34.26x17 11x22 35.38-33 7-12 36.34-29 12-17 37.41-37 8-12 38.37-31 6-11 39.33-28 22x33 40.39x28 12-18 41.31x22 18x27 42.42-37 27-32 43.29-23 32x41 44.36x47 5-10 45.24-19 13x24

Roozenburg-variation

O. Mol – G. Jansen 1997 (2-0) 1.32-28 18-22 2.37-32 12-18 3.41-37 7-12 4.46-41 1- 7 5.31-26 19-23 6.28x19 14x23 7.32-28 23x32 8.37x28 16-21 9.41-37 21-27 10.37-31 20-24 11.47-41 10-14 12.41-37 11-16 13.37-32 5-10 14.32x21 16x27 15.34-29 7-11 16.29x20 15x24 17.40-34 13-19 18.45-40 9-13 19.34-30 3- 9 20.30-25 2- 7 21.40-34 10-15 22.34-30 18-23 23.50-45 23x32 24.33-29 24x33 25.39x37 19-23 26.37-32 11-16 27.32x21 16x27 28.30-24 6-11 29.44-39 12-18 30.39-34 8-12 31.34-30 23-28 32.24-19 14x23 33.38-32 27x47 34.30-24 47x20 35.25x 3 11-16 36.43-38 23-29 37. 3-14 28-33 38.35-30 33x42 39.48x37 29-33 40.45-40 7-11 41.40-35 16-21 42.30-24 11-16 43.14- 3 22-28 44.37-32 28x37 45.31x42 18-23 46. 3-25 21-27 47.25-48 33-38 48.42x33 23-29 49.26-21

Fork-lock-variation

A. Getmanski – I. Kostionov 2003 (2-0) 1.32-28 18-22 2.37-32 12-18 3.41-37 7-12 4.46-41 1- 7 5.31-26 20-25 6.36-31 14-20 7.41-36 10-14 8.47-41 5-10 9.32-27 19-23 10.28x19 14x23 11.34-30 25x34 12.40x29 23x34 13.39x30 20-25 14.44-39 25x34 15.39x30 10-14 16.30-25 14-19 17.35-30 19-23 18.49-44 9-14 19.44-40 4-10 20.40-35 14-19 21.33-29 23x34 22.30x39 10-14 23.39-33 19-23 24.35-30 14-20 25.25x14 13-19 26.14-10 15x 4 27.37-32 3- 9 28.41-37 9-14 29.43-39 4-10 30.45-40 10-15 31.39-34 8-13 32.40-35 23-28 33.32x23 19x39 34.34x43 13-19 35.38-33 19-23 36.43-39 15-20 37.42-38 23-28 38.30-25 20-24 39.37-32 28x37 40.31x42 22x31 41.26x37 18-23 42.39-34 2- 8 43.34-30 14-19 44.33-29 23x34 45.30x39 8-13 46.39-34 19-23 47.38-33 12-18 48.33-29 24x33 49.25-20 17-22 50.20-15 23-28 51.15-10 22-27 52.10- 4 11-17 53.34-29 33x24 54. 4-15

1.32 – 28 17 – 21 The hedgehog

F. Teer – A. Shwarzman 1999 (0-2) 1.32-28 17-21 2.33-29 21-26 3.39-33 16-21 4.44-39 11-16 5.50-44 6-11 6.38-32 21-27 7.31x22 18x38 8.43x32 16-21 9.42-38 20-25 10.47-42 15-20 11.49-43 11-16 12.37-31 26x37 13.42x31 21-26 14.32-27 26x37 15.41x32 19-24 16.46-41 14-19 17.41-37 10-14 18.48-42 5-10 19.36-31 7-11 20.31-26 2- 7 21.27-22 12-17 22.29-23 8-12 23.34-30 25x34 24.39x30 10-15 25.44-39 16-21 26.30-25 4-10 27.22-18 13x22 28.40-34 11-16 29.45-40 3- 8 30.34-29 7-11 31.40-34 21-27 32.32x21 16x27 33.34-30 11-16 34.23-18 12x41 35.42-37 41x32 36.29-23 19x28 37.30x19 14x23 38.25x21 23-29 39.33x24 1- 7 40.35-30 7-12 41.30-25 12-18 42.39-34 27-31 43.38x36 16x27 44.43-38 10-14 45.34-29 18-23 46.29x18 22x13

Y. Lagoda – A. Shwarzman 2007 (0-2) 1.32-28 16-21 2.34-29 21-26 3.40-34 17-21 4.45-40 11-16 5.50-45 6-11 6.37-32 26x37 7.42x31 21-26 8.47-42 26x37 9.42x31 1- 6 10.48-42 16-21 11.31-26 20-24 12.26x17 12x21 13.29x20 15x24 14.41-37 7-12 15.46-41 10-15 16.36-31 21-26 17.41-36 11-16 18.34-29 5-10 19.29x20 15x24 20.40-34 10-15 21.44-40 4-10 22.49-44 6-11 23.34-29 11-17 24.29x20 15x24 25.40-34 10-15 26.34-29 17-21 27.29x20 15x24 28.45-40 18-23 29.40-34 12-18 30.31-27 8-12 31.34-30 12-17 32.30-25 2- 8 33.44-40 14-20 34.25x14 9x20 35.40-34 3- 9 36.34-30 20-25 37.28-22 17x28 38.33x22 25x34 39.39x30 23-29 40.30-25 18-23 41.43-39 9-14 42.39-34 29x40 43.35x44 23-29 44.22-17 21x12 45.32-28 29-34 46.37-32 24-30 47.27-22 12-18 48.22-17 16-21 49.32-27 21x43 50.17-11 34-39

100

1.32 – 28 16 – 21 The black panther

T. Gerritsen – A. Domchev 2010 (2-0) 1.32-28 16-21 2.31-26 18-22 3.37-32 11-16 4.41-37 7-11 5.34-29 1- 7 6.40-34 13-18 7.45-40 19-23 8.28x19 14x23 9.46-41 21-27 10.32x21 16x27 11.29-24 20x29 12.33x24 9-13 13.34-30 13-19 14.24x13 8x19 15.38-33 4- 9 16.37-31 9-13 17.42-38 10-14 18.40-34 14-20 19.30-25 3- 8 20.25x14 19x10 21.35-30 15-20 22.30-25 10-14 23.34-30 14-19 24.25x14 19x10 25.50-45 10-14 26.30-25 23-28 27.41-37 11-16 28.37-32 28x37 29.31x42 13-19 30.44-40 5-10 31.39-34 18-23 32.34-30 12-18 33.40-34 7-12 34.45-40 10-15 35.33-29 14-20 36.25x14 19x10 37.30-25 10-14 38.40-35 8-13 39.43-39 13-19 40.35-30 2- 8 41.38-33 14-20 42.25x14 19x10 43.30-24 10-14 44.24-19 23-28 45.19x10 15x 4 46.48-43 8-13 47.34-30 6-11 48.30-25 4-10 49.25-20 10-14 50.20x 9 13x 4 51.29-24 18-23 52.42-37 27-32 53.37-31 23-29 54.24-20 29x38 55.20-15

R. Palmer – T. Sijbrands 1970 (0-2) 1.32-28 17-21 2.31-26 12-17 3.37-32 7-12 4.36-31 19-23 5.28x19 14x23 6.33-28 9-14 7.28x19 14x23 8.31-27 10-14 9.38-33 23-28 10.32x23 18x38 11.43x32 14-19 12.39-33 5-10 13.44-39 10-14 14.42-38 12-18 15.49-43 18-23 16.34-29 23x34 17.39x30 19-23 18.30-25 13-19 19.33-29 23x34 20.40x29 1- 7 21.41-37 7-12 22.47-42 12-18 23.46-41 8-13 24.41-36 4- 9 25.29-23 18x29 26.27-22 17x28 27.32x34 13-18 28.26x17 11x22 29.50-44 2- 8 30.44-39 8-12 31.39-33 6-11 32.34-29 9-13 33.29-24 20x29 34.33x24 19x30 35.35x24 16-21 36.45-40 21-27 37.40-34 18-23 38.43-39 12-18 39.39-33 23-28 40.33-29 14-19 41.34-30 19-23 42.48-43 23x34 43.30x39 11-17 44.37-31 3- 9 45.39-34 9-14 46.42-37 14-19 47.34-30 18-23 48.25-20 23-29 49.24x33 15x35

1.32 – 28 20 – 25 The Russian bear

M. Korchow – A. Andreiko 1972 (0-2) 1.32-28 20-25 2.37-32 15-20 3.41-37 10-15 4.46-41 5-10 5.31-27 19-23 6.28x19 14x23 7.33-28 9-14 8.28x19 14x23 9.39-33 10-14 10.44-39 13-19 11.33-28 8-13 12.39-33 2- 8 13.49-44 4- 9 14.44-39 17-21 15.36-31 21-26 16.41-36 12-17 17.34-29 23x34 18.40x29 17-22 19.28x17 11x22 20.29-23 19x28 21.32x12 7x18 22.50-44 14-19 23.33-28 22x33 24.39x28 19-23 25.28x19 13x24 26.27-22 18x27 27.31x22 9-13 28.38-32 8-12 29.32-27 6-11 30.37-31 26x37 31.42x31 24-30 32.35x24 20x29 33.47-42 15-20 34.42-38 20-24 35.44-40 1- 6 36.38-32 11-17 37.22x11 6x17 38.40-34 29x40 39.45x34 17-21 40.31-26 12-17 41.43-39 13-18 42.48-43 3- 9 43.43-38 9-14 44.38-33 24-30 45.33-28 30-35 46.36-31 14-19 47.28-22 17x37 48.26x17 37x26 49.27-21 16x27 50.17-11 27-31 51.11- 7 31-37 52. 7- 1 18-22 53. 1- 6 22-27 54. 6-28 37-42 55.28x10 42-48 56.10-41 27-31 57.41-32 31-36 58.32-46 48-31 59.39-33 31-48 60.34-29 48-42

D. Droezjinin – H. Wiersma 2002 (1-1) 1.32-28 20-25 2.37-32 15-20 3.41-37 10-15 4.46-41 5-10 5.31-27 19-23 6.28x19 14x23 7.33-28 9-14 8.28x19 14x23 9.39-33 10-14 10.44-39 13-19 11.49-44 17-21 12.36-31 21-26 13.41-36 4- 9 14.33-28 8-13 15.39-33 2- 8 16.47-41 23-29 17.34x23 18x29 18.33x24 20x29 19.44-39 14-20 20.50-44 9-14 21.35-30 25x34 22.39x30 3- 9 23.40-35 20-24 24.44-39 29-34 25.30-25 24-30 26.35x24 19x30 27.39-33 30-35 28.43-39 34x43 29.48x39 13-19 30.27-22 8-13 31.31-27 19-24 32.36-31 12-18 33.41-36 7-12 34.45-40 35x44 35.39x50 14-19 36.50-45 9-14 37.45-40 15-20 38.40-34 24-30

101

The cow

R. Clerc – A. Chizhov 2001 (1-1) 1.32-28 20-24 2.34-30 14-20 3.30-25 10-14 4.37-32 18-23 5.42-37 4-10 6.28-22 17x28 7.33x22 12-18 8.47-42 18x27 9.31x22 8-12 10.37-31 12-18 11.32-27 7-12 12.41-37 24-30 13.35x24 20x29 14.31-26 14-20 15.25x14 9x20 16.27-21 16x27 17.22x31 10-14 18.31-27 5-10 19.39-34 11-17 20.44-39 20-25 21.37-32 15-20 22.27-21 10-15 23.21-16 1- 7 24.32-27 3- 8 25.27-21 18-22 26.46-41 13-18 27.41-37 8-13 28.37-31 22-28 29.31-27 7-11 30.16x 7 2x11 31.21-16 20-24 32.16x 7 12x 1 33.27-21 17-22 34.42-37 6-11 35.38-32 29-33 36.40-35 33x44 37.50x39 22-27 38.21-17 27x38 39.17x 6 28-33 40.39x28 23x41 41.36x47 18-22 42.43x32 24-30 43.35x24 19x39 44.47-41 25-30 45.41-36 15-20 46.32-27 22x31 47.36x27 20-24 48.26-21 30-35 49.45-40 35x44 50.49x40 24-29 51.21-17 29-34 52.40x29 39-44 53.29-24

1.33 – 29

A. Getmanski – A. Baliakin 2011 (1-1) 1.33-29 19-23 2.35-30 20-25 3.40-35 14-20 4.44-40 10-14 5.38-33 14-19 6.30-24 19x30 7.35x24 17-22 8.42-38 11-17 9.32-28 23x32 10.37x28 16-21 11.41-37 21-27 12.46-41 6-11 13.50-44 11-16 14.48-42 7-11 15.31-26 27-31 16.36x27 22x31 17.37-32 31-36 18.41-37 9-14 19.28-23 1- 6 20.40-35 4-10 21.44-40 17-22 22.32-28 11-17 23.34-30 25x34 24.39x30 22-27 25.37-32 6-11 26.32x21 16x27 27.38-32 27x38 28.43x32 11-16 29.49-43 18-22 30.32-27 22x31 31.26x37 16-21 32.43-39 21-26 33.40-34 17-21 34.42-38 21-27 35.37-32 26-31 36.32x21 12-18 37.23x12 8x26 38.38-32 13-18 39.30-25 2- 8 40.45-40 8-12 41.32-27 31x22 42.28x 8 3x12 43.33-28 12-17 44.28-23 18-22 45.35-30 26-31 46.23-19 14x23 47.29x27 20x29 48.34x23 31x22 49.30-24 17-21 50.25-20 22-27 51.23-19 27-32 52.19-13 32-37 53.13- 8 37-41 54. 8- 3 21-26 55.40-35 41-46 56.35-30 46-32 57.20-14 10x19 58.24x13 32-16 59.39-34 26-31 60.13- 9 31-37 61. 9- 4 37-41 62.30-24 41-46 63.34-30 46-37 64. 3-26 37-14 65. 4-13 16-27 66.13x31 36x27 67.30-25 5-10 68.26-12 14- 3 69.12-40

Keller-opening

V. Wirny – H. Wiersma 1984 (2-0) 1.33-29 17-22 2.39-33 11-17 3.44-39 6-11 4.50-44 1- 6 5.31-26 16-21 6.32-28 19-23 7.28x19 14x23 8.35-30 10-14 9.30-24 23-28 10.40-35 20-25 11.24-20 15x24 12.29x20 14-19 13.20-15 11-16 14.44-40 5-10 15.34-30 25x34 16.40x29 19-23 17.29-24 9-14 18.33-29 23x34 19.39x30 14-19 20.30-25 19x30 21.25x34 21-27 22.37-31 10-14 23.43-39 13-19 24.35-30 19-23 25.38-33 8-13 26.45-40 2- 8 27.40-35 17-21 28.26x17 12x21 29.33-29 7-12 30.30-25 21-26 31.29-24 26x37 32.41x21 16x27 33.34-30 14-19 34.25-20 12-17 35.30-25 19x30 36.25x34 3- 9 37.42-37 6-11 38.47-41 11-16 39.49-43 17-21 40.37-31 21-26 41.41-37 27-32 42.35-30 32x41 43.46x37 8-12 44.43-38 16-21 45.30-24 21-27 46.34-30 23-29 47.24x33 18-23 48.39-34 28x39 49.34x43 23-28 50.30-24 12-17 51.37-32 28x37 52.31x42 22-28 53.42-37 17-22 54.48-42 28-33 55.38x29 22-28 56.42-38

102

Krajenbrink-attack

A. Gantwarg – T. Sijbrands 1989 (1-1) 1.33-29 16-21 2.31-26 11-16 3.37-31 6-11 4.31-27 18-22 5.27x18 13x22 6.41-37 9-13 7.39-33 13-18 8.44-39 19-23 9.50-44 21-27 10.32x21 16x27 11.35-30 8-13 12.30-25 4- 9 13.37-31 14-19 14.25x14 9x20 15.29-24 19x30 16.34x14 10x19 17.40-34 5-10 18.44-40 10-14 19.34-30 14-20 20.30-25 3- 8 21.25x14 19x10 22.40-34 10-14 23.45-40 13-19 24.40-35 23-28 25.42-37 18-23 26.37-32 28x37 27.31x42 12-18 28.34-30 7-12 29.39-34 1- 7 30.30-25 23-28 31.43-39 18-23 32.46-41 12-18 33.49-43 7-12 34.41-37 8-13 35.34-29 23x34 36.39x30 28x39 37.43x34 19-23 38.30-24 13-19 39.24x13 18x 9 40.35-30 9-13 41.38-32 27x38 42.42x33 22-27 43.34-29 23x34 44.30x39 12-18 45.33-29 13-19 46.48-42 19-23 47.39-34 17-22 48.37-32 27x38 49.42x33 15-20 50.34-30 23x34 51.30x39 22-27 52.33-29 11-17 53.39-33 17-22 54.36-31 27x36 55.26-21 2- 7 56.21-16 22-27 57.33-28 27-31 58.47-41

The buffalo

A. Gantwarg - A. Valiuk 1995 (0-2) 1.33-29 18-22 2.31-26 20-24 3.29x20 15x24 4.34-30 22-28 5.32x23 19x28 6.30x19 14x23 7.36-31 10-14 8.41-36 5-10 9.38-32 14-20 10.46-41 12-18 11.42-38 7-12 12.32-27 17-22 13.38-32 20-24 14.47-42 1- 7 15.42-38 9-14 16.38-33 13-19 17.43-38 8-13 18.49-43 4- 9 19.48-42 11-17 20.40-34 6-11 21.44-40 10-15 22.27-21 16x27 23.32x21 14-20 24.31-27 22x31 25.36x27 24-29 26.33x22 17x28 27.21-16 20-24 28.37-31 15-20 29.42-37 11-17 30.27-21 18-22 31.34-30 13-18 32.30-25 29-33 33.38x29 24x44 34.25x14 9x20 35.40x49 20-24 36.41-36 3- 9 37.45-40 7-11 38.16x 7 2x11 39.21-16 9-14 40.16x 7 12x 1 41.43-38 14-20 42.40-34 1- 7 43.49-43 7-11 44.38-32 28-33 45.43-38 33x42 46.37x48 22-28 47.48-43 28x37 48.31x42 11-16 49.42-37 16-21 50.37-32 18-22 51.36-31 22-28 52.50-44 28x37 53.31x42 21-27 54.44-39 23-28 55.43-38 28-32 56.38-33 20-25 57.42-38 32x43 58.39x48 27-32 59.48-42 19-23 60.35-30 24x35 61.33-28 32-38 62.28x19 38x47 63.19-13 47-41 64.34-30 25x34

A. Baliakin – M. Korenevski 1989 (2-0) 1.33-29 18-22 2.31-26 20-24 3.29x20 15x24 4.34-30 13-18 5.36-31 18-23 6.32-27 12-18 7.37-32 7-12 8.41-37 8-13 9.40-34 1- 7 10.45-40 2- 8 11.46-41 14-20 12.30-25 10-15 13.25x14 9x20 14.34-30 20-25 15.50-45 25x34 16.40x20 15x24 17.39-34 5-10 18.43-39 10-14 19.48-43 4-10 20.34-30 14-20 21.44-40 3- 9 22.30-25 9-14 23.40-34 24-29 24.34-30 20-24 25.39-33 16-21 26.27x16 22-28 27.33x22 18x36 28.45-40 13-18 29.43-39 18-22 30.37-31 36x27 31.32x21 10-15 32.49-43 15-20 33.41-36 23-28 34.39-34 29-33 35.38x29 24x33 36.43-38 8-13 37.38x29 28-32 38.47-41 22-28 39.41-37 32x41 40.36x47 28-32 41.30-24 19x39 42.40-34 39x30 43.35x15 13-18 44.47-41 18-22 45.41-36 22-28 46.42-37 32x41 47.36x47 28-32 48.47-42

103

1.33 – 28 Sijbrands opening

Old Dutch

A. Kuyken – V. Agafonow 1969 (2-0) 1.33-28 18-23 2.39-33 12-18 3.31-27 7-12 4.44-39 20-24 5.37-31 14-20 6.41-37 2- 7 7.27-22 18x27 8.31x22 10-14 9.34-30 16-21 10.30-25 4-10 11.49-44 21-26 12.47-41 24-29 13.33x24 20x29 14.39-33 14-20 15.33x24 20x29 16.44-39 10-14 17.50-44 5-10 18.35-30 17-21 19.40-35 12-18 20.39-33 18x27 21.33x24 7-12 22.28-22 27x18 23.32-28 23x32 24.38x 7

Modern play

C. Pippel – A. Mathijsen 2001 (0-2) 1.33-28 18-22 2.38-33 12-18 3.34-29 7-12 4.40-34 20-25 5.42-38 1- 7 6.47-42 14-20 7.45-40 9-14 8.31-26 16-21 9.37-31 11-16 10.41-37 4- 9 11.46-41 7-11 12.50-45 2- 7 13.29-24 20x29 14.34x23 18x29 15.33x24 22x33 16.38x29 19x30 17.35x24 14-19 18.40-35 19x30 19.35x24 10-14 20.44-40 14-19 21.40-35 19x30 22.35x24 5-10 23.49-44 10-14 24.45-40 14-19 25.40-35 19x30 26.35x24 9-14 27.44-40 14-19 28.40-35 19x30 29.35x24 3- 9 30.39-33 21-27 31.31x22 17x39 32.43x34 16-21 33.26x17 11x22 34.42-38 9-14 35.36-31 14-19 36.34-30 25x23 37.32-27 19x30 38.27x 9 8-13 39. 9x29 15-20 40.29-23 20-24 41.38-33 30-35 42.33-29 24x33 43.23-19 35-40 44.19-14 40-44 45.14-10 44-49 46.10- 4 33-39 47. 4-15 39-44 48.41-36 44-50

The seagull

G. Valneris – A. Chizhov 1991 (0-2) 1.33-28 17-21 2.39-33 21-26 3.31-27 11-17 4.44-39 17-22 5.28x17 12x21 6.33-28 7-12 7.38-33 6-11 8.50-44 1- 6 9.42-38 19-23 10.28x19 14x23 11.47-42 9-14 12.35-30 20-25 13.40-35 4- 9 14.33-29 12-17 15.38-33 14-20 16.33-28 2- 7 17.28x19 13x33 18.39x28 17-22 19.28x17 11x31 20.36x27 7-11 21.44-40 8-12 22.43-38 10-14 23.38-33 14-19 24.33-28 5-10 25.49-43 9-13 26.28-23 19x28 27.32x23 21x32 28.37x28 18x29 29.34x23 25x34 30.40x29 10-14 31.45-40 13-19 32.43-39 16-21 33.42-38 26-31 34.38-33 31-36 35.41-37 21-26 36.48-42 3- 9 37.37-32 11-17 38.40-34 26-31 39.32-27 31x22 40.42-38 9-13 41.34-30 36-41 42.46x37 12-18 43.23x21 20-25 44.28x17 25x41 45.21-16 41-47

1.34 – 29 Fork-lock-opening

A. Georgiev – T. Sijbrands 1999 (0-2) 1.34-29 20-25 2.40-34 15-20 3.45-40 10-15 4.32-28 17-21 5.31-26 19-24 6.26x17 11x22 7.28x17 12x21 8.37-32 21-26 9.32-28 18-22 10.28x17 16-21 11.38-32 21x12 12.32-28 13-18 13.36-31 26x37 14.41x32 9-13 15.50-45 18-22 16.28x17 12x21 17.42-37 4- 9 18.46-41 21-26 19.32-28 5-10 20.37-32 14-19 21.41-37 10-14 22.43-38 8-12 23.49-43 6-11 24.37-31 26x37 25.32x41 11-17 26.41-37 7-11 27.48-42 17-21 28.38-32 2- 8 29.47-41 21-26 30.42-38 12-18 31.41-36 1- 6 32.36-31 11-16 33.32-27 6-11 34.35-30 24x35 35.29-23 18x29 36.34x23 13-18 37.23x12 8x17 38.40-34 17-21 39.27-22 3- 8 40.37-32 26x37 41.32x41 11-17 42.22x11 16x 7 43.41-37 8-12 44.38-32 9-13 45.43-38 13-18 46.44-40 35x44 47.39x50 18-23 48.37-31 21-26 49.31-27 20-24 50.45-40 24-30 51.40-35 30x39 52.33x44 15-20 53.44-39 20-24 54.50-45 14-20 55.45-40 7-11 56.39-33 23-29 57.40-34 29x40 58.35x44 25-30 59.28-22 20-25

104

A. Dibman – J. Stokkel 1983 (2-0) 1.33-29 19-23 2.39-33 14-19 3.44-39 10-14 4.50-44 5-10 5.31-26 20-25 6.37-31 14-20 7.41-37 10-14 8.46-41 4-10 9.32-28 23x32 10.37x28 19-23 11.28x19 13x24 12.41-37 8-13 13.37-32 14-19 14.42-37 2- 8 15.47-41 17-22 16.32-28 10-14 17.28x17 12x21 18.26x17 11x22 19.38-32 8-12 20.33-28 22x33 21.29x38 6-11 22.31-26 11-17 23.32-27 1- 6 24.37-31 7-11 25.48-42 3- 8 26.42-37 17-21 27.26x17 12x32 28.38x27 8-12 29.31-26 12-17 30.37-31 18-23 31.41-37 24-29 32.34-30 25x34 33.39x30 29-33 34.43-38 33x42 35.37x48 20-24 36.40-34 24-29 37.44-39 29x40 38.45x34 14-20 39.30-25 20-24 40.34-30 9-14 41.49-43 23-29 42.43-38 29-34 43.38-33 34x43 44.48x39 13-18 45.27-21 16x27 46.31x13 19x 8 47.30x10 15x 4 48.25-20 17-21 49.26x17 11x22 50.20-14 6-11 51.35-30 11-17 52.30-24 22-27 53.33-28 17-22 54.28x17 27-32 55.36-31 32-38 56.39-33 38x 9

The peacock

W. Vrijland – W. van der Wijk 2000 (1-1) 1.34-29 17-22 2.40-34 11-17 3.32-28 6-11 4.37-32 19-23 5.28x19 14x23 6.41-37 10-14 7.35-30 20-25 8.45-40 5-10 9.46-41 1- 6 10.50-45 14-19 11.40-35 9-14 12.44-40 3- 9 13.31-27 22x31 14.36x27 23-28 15.33x22 17x28 16.32x23 19x28 17.38-32 13-19 18.32x23 19x28 19.42-38 9-13 20.30-24 11-17 21.38-32 17-22 22.32x23 22x42 23.47x38 14-20 24.38-33 6-11 25.49-44 18-22 26.34-30 25x34 27.39x30 20-25 28.43-38 25x34 29.24-19 13x24 30.29x20 15x24 31.40x20 11-17 32.35-30 8-13 33.30-24 7-11 34.23-19 12-18 35.19x 8 2x13 36.33-29 13-19 37.24x13 18x 9 38.44-39 10-14 39.20-15 22-28 40.41-37 9-13 41.29-24 16-21 42.24-20 14x25 43.38-32 11-16 44.32x23 21-27 45.45-40 16-21 46.40-35 13-18 47.23x12 17x 8 48.39-33 8-13 49.33-29 13-18 50.29-24 18-23 51.48-43 21-26 52.43-38

1.34 – 30 French opening

The cheetah

F. Andriessen – R. Boomstra 2007 (0-2) 1.34-29 20-25 2.29-24 19x30 3.35x24 18-22 4.33-29 14-20 5.38-33 10-14 6.32-28 16-21 7.37-32 11-16 8.43-38 6-11 9.31-27 22x31 10.36x27 21-26 11.41-36 4-10 12.47-41 26-31 13.27-21 16x27 14.32x21 17x26 15.36x27 14-19 16.40-35 19x30 17.35x24 9-14 18.44-40 14-19 19.40-35 19x30 20.35x24 10-14 21.28-23 13-19 22.24x13 8x28 23.33x22 14-19 24.41-37 3- 8 25.37-32 8-13 26.46-41 12-18 27.32-28 7-12 28.39-34 2- 8 29.45-40 20-24 30.29x20 15x24 31.41-37 18-23 32.37-32 12-18 33.49-43 8-12 34.50-45 5-10 35.34-29 24x33 36.38x29 23x34 37.40x29 26-31

A. Gantwarg – H. Wiersma 1979 (1-1) 1.34-30 20-25 2.30-24 19x30 3.35x24 18-22 4.33-29 14-20 5.38-33 10-14 6.42-38 16-21 7.31-26 11-16 8.37-31 21-27 9.32x21 16x27 10.41-37 6-11 11.37-32 11-16 12.32x21 16x27 13.46-41 14-19 14.41-37 19x30 15.40-34 13-18 16.37-32 9-13 17.32x21 30-35 18.21-16 13-19 19.38-32 5-10 20.32-28 10-14 21.43-38 4-10 22.28-23 19x28 23.31-27 22x31 24.33x13 8x19 25.26x37 12-18 26.39-33 19-23 27.38-32 14-19 28.33-28 20-24 29.29x20 15x24 30.34-30 25x34 31.44-40 35x44 32.49x20 10-15 33.20-14 19x10 34.28x19 2- 8 35.47-42 3- 9 36.42-38 9-13 37.38-33 13x24 38.48-43 10-14 39.36-31 14-19 40.43-39 15-20 41.31-27 17-21 42.45-40 8-12 43.37-31 12-17 44.31-26 19-23 45.16-11 17x 6 46.26x17 7-11 47.17-12 18x 7 48.40-34 11-17 49.50-44 7-12 50.33-29 24x33 51.39x19 12-18 52.32-28 6-11 53.44-40 18-23 54.19-13 23x21 55.13- 9 21-27

105

Ottink-variation

T. Sijbrands – V. Doumesh 2007 (2-0) 1.34-30 17-22 2.31-26 11-17 3.30-25 6-11 4.37-31 1- 6 5.32-27 19-23 6.33-29 23x34 7.40x29 13-19 8.41-37 9-13 9.37-32 4- 9 10.44-40 20-24 11.29x20 15x24 12.46-41 19-23 13.41-37 14-20 14.25x14 10x19 15.40-34 9-14 16.34-30 5-10 17.45-40 10-15 18.39-34 14-20 19.50-45 20-25 20.38-33 3- 9 21.42-38 15-20 22.47-42 9-14 23.33-29 24x33 24.38x29 22-28 25.49-44 28-33 26.29x38 20-24 27.27-21 16x27 28.32x21 11-16 29.38-33 16x27 30.31x11 6x17 31.34-29 25x34 32.29x 9 13x 4 33.40x29 23x34 34.44-39

1.31 – 27 Polish opening

Semi-classical opening

E. Hoogendoorn - W. van der Kooij 1997 (2-0) 1.31-27 19-23 2.33-28 17-21 3.28x19 14x23 4.39-33 10-14 5.44-39 21-26 6.34-30 14-19 7.30-25 11-17 8.25x14 9x20 9.35-30 5-10 10.30-25 10-14 11.40-34 4- 9 12.45-40 20-24 13.50-45 14-20 14.25x14 9x20 15.40-35 3- 9 16.34-30 9-14 17.49-44 7-11 18.44-40 17-22 19.30-25 22x31 20.36x27 11-17 21.33-28 17-22 22.28x17 12x21 23.39-34 24-30 24.35x24 19x39 25.43x34 14-19 26.25x14 19x10 27.38-33 10-14 28.40-35 13-19 29.34-30 15-20 30.45-40 6-11 31.40-34 11-17 32.33-29 17-22 33.41-36 22x31 34.36x27 8-12 35.46-41 2- 8 36.48-43 20-25 37.43-39 12-17 38.29-24 8-13 39.39-33 1- 6 40.33-29 17-22 41.41-36 22x31 42.36x27 23-28 43.32x12 21x41 44.47x36 6-11 45.24-20 19-23 46.29x 9 14x 3 47.20-14

K. Thijssen - R. Cousijnsen 1996 (2-0) 1.31-27 19-23 2.33-28 17-21 3.28x19 14x23 4.39-33 10-14 5.34-30 14-19 6.30-25 21-26 7.25x14 9x20 8.35-30 5-10 9.44-39 10-14 10.30-25 4- 9 11.40-34 11-17 12.45-40 17-21 13.50-45 7-11 14.34-30 20-24 15.40-35 12-17 16.49-44 23-29 17.44-40 18-23 18.27-22 17x28 19.33x22 11-17 20.22x11 6x17 21.39-34 17-22 22.32-27 21x32 23.37x17 16-21 24.17-11 1- 6 25.38-32 6x17 26.32-28 23x32 27.34x23 19x28 28.30x10 15x 4 29.42-37 21-27 30.47-42 17-22 31.43-39 26-31 32.37x26 8-12 33.40-34 12-17 34.35-30 13-18 35.30-24 2- 8 36.45-40 9-14 37.40-35 8-13 38.48-43 3- 9 39.34-29 4-10 40.42-38 10-15 41.38-33 14-19 42.25-20 19x30 43.35x24 17-21 44.26x17 22x11 45.33x31 13-19 46.24x 4 15x44 47. 4x50

H. Wiersma – J. Van der Wal 1979 1.31-27 19-23 2.33-28 17-21 3.28x19 14x23 4.38-33 21-26 5.34-30 10-14 6.30-25 14-19 7.25x14 9x20 8.35-30 5-10 9.43-38 10-14 10.49-43 4- 9 11.40-35 11-17 12.45-40 7-11 13.39-34 20-25 14.44-39 14-20 15.33-29 9-14 16.50-45 1- 7 17.38-33 3- 9 18.42-38 17-22 19.47-42 22x31 20.36x27 20-24 21.29x20 15x24 22.33-28 11-17 23.39-33 14-20 24.41-36 17-22 25.28x17 12x21 26.33-29 24x33 27.38x29 20-24 28.29x20 25x14 29.43-39 8-12 30.30-24 19x30 31.34x25 23-28 32.32x23 21x41 33.36x47 18x29 34.42-38 13-19 35.39-33 9-13 36.33x24 19x30 37.35x24 12-18 38.40-34 7-12 39.34-30 6-11 40.24-20 2- 8 41.20x 9 13x 4 42.25-20 8-13 43.30-24 11-17 44.20-14 17-22 45.14- 9 22-27 46.38-33 12-17 47.33-28 18-22 48. 9x18 22x13 49.28-23 27-32 50.23-19 13-18 51.24-20 26-31 52.19-14 31-37 53.47-42 17-21 54.42x31 21-26 55.31-27 32x21 56.20-15 21-27 57.14-10 26-31 58.10- 5 18-22 59.45-40 31-36 60. 5-14 16-21 61.14-20 22-28 62.40-34 27-32 63.46-41 36x47

106

The big leap

E. Prosman – A. Droog 1996 (2-0) 1.31-27 17-22 2.36-31 16-21 3.27x16 22-28 4.32x23 19x28 5.33x22 18x36 6.37-32 14-19 7.41-37 10-14 8.39-33 12-18 9.44-39 20-24 10.34-30 18-23 11.40-34 14-20 12.46-41 24-29 13.33x24 20x40 14.45x34 11-17 15.38-33 7-11 16.16x 7 1x12 17.42-38 5-10 18.30-25 10-14 19.34-29 23x34 20.39x30 19-23 21.50-44 14-20 22.25x14 9x20 23.44-39 4- 9 24.49-44 6-11 25.44-40 12-18 26.40-34 13-19 27.30-25 8-12 28.25x14 9x20 29.34-29 23x34 30.39x30 3- 9 31.43-39 2- 8 32.32-28 8-13 33.33-29 17-21 34.28-23 19x28 35.47-42 36x47 36.38-33 47x38 37.33x22 18x27 38.39-34 38x24 39.30x 6

1.31 – 26 The edge-opening

G. Valneris – A. Chizhov 2001 (1-1) 1.31-26 19-23 2.36-31 14-19 3.41-36 10-14 4.46-41 5-10 5.31-27 20-24 6.36-31 15-20 7.33-28 10-15 8.41-36 4-10 9.47-41 17-21 10.26x17 11x33 11.39x28 23-29 12.34x23 18x29 13.27-21 16x27 14.31x22 6-11 15.36-31 11-16 16.41-36 12-17 17.22x11 29-34 18.40x29 24x22 19.11- 6 19-24 20.32-27 8-12 21.27x18 12x23 22.31-26 20-25 23.37-31 14-20 24.44-39 10-14 25.42-37 3- 8 26.31-27 14-19 27.45-40 9-14 28.37-32 24-30 29.35x24 19x30 30.39-33 13-19 31.33-28 30-35 32.40-34 20-24 33.38-33 8-13 34.36-31 7-12 35.26-21 2- 8 36.50-45 13-18 37.43-39 23-29 38.34x23 18x38 39.32x43 24-30 40.39-33 14-20 41.45-40 35x44 42.49x40 30-35 43.43-39 35x44 44.39x50 25-30 45.28-22 30-34 46.31-26 20-24 47.33-28 34-39 48.22-17 24-29 49.28-22 8-13 50.17x 8 13x 2 51.22-18 29-34 52.21-17 34-40 53.17-12 40-44 54.26-21 2- 7 55.12- 8 44-49 56.27-22 16x27 57.22x31 49-16 58.48-42 7-12 59. 8x17 39-43 60.42-38 43x32 61.18-12 32-38 62.31-27 16x32 63.12- 8 38-42 64. 8- 2 42-48 65. 2x35 32-16 66.35- 2

1.35 – 30 The wild horse

R. Clerc – A. Gantwarg 1985 (0-2) 1.35-30 20-25 2.40-35 15-20 3.45-40 20-24 4.33-29 24x33 5.38x29 18-22 6.30-24 19x30 7.35x24 14-19 8.40-35 19x30 9.35x24 10-14 10.24-20 14-19 11.20-15 12-18 12.39-33 7-12 13.44-39 9-14 14.42-38 5-10 15.47-42 1- 7 16.31-27 22x31 17.37x26 3- 9 18.41-37 19-23 19.46-41 14-19 20.37-31 10-14 21.31-27 19-24 22.29x20 23-28 23.32x23 18x40 24.50-45 14-19 25.45x34 25x14 26.36-31 12-18 27.41-36 7-12 28.34-30 2- 7 29.38-32 19-23 30.42-38 17-22 31.30-25 13-19 32.33-29 23x34 33.39x30 19-23 34.43-39 9-13 35.48-42 13-19 36.42-37 4-10 37.15x 4 14-20 38.25x14 19x10 39. 4x15 23-28 40.32x23 18x29 41.15x17 12x25 42.37-32 25-30 43.31-27 7-12 44.32-28 11-17 45.27-22 30-34 46.22x11 6x17 47.28-23 34-40

A. Cordier – T. Sijbrands 1999 (0-2) 1.35-30 20-25 2.40-35 15-20 3.45-40 20-24 4.33-29 24x33 5.38x29 10-15 6.50-45 5-10 7.42-38 16-21 8.47-42 21-26 9.39-33 15-20 10.44-39 19-24 11.30x19 13x24 12.49-44 9-13 13.35-30 24x35 14.29-23 18x29 15.33x15 12-18 16.32-28 17-22 17.28x17 11x22 18.31-27 22x31 19.36x27 14-19 20.34-29 3- 9 21.38-33 19-23 22.40-34 6-11 23.44-40 35x44 24.39x50 11-17 25.34-30 25x34 26.29x40 8-12 27.50-44 7-11 28.44-39 1- 7 29.42-38 2- 8 30.40-34 17-22 31.37-32 22x31 32.32-28 23x32 33.38x36 11-17 34.36-31 26x37 35.41x32 17-22 36.34-29 7-11 37.43-38 10-14 38.46-41 14-19 39.41-37 19-23 40.48-43 23x34

107