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Lee Sedol 9P+ The Match Leo Dorst The First Match (Nature, January 2016): AlphaGo vs Fan Hui 2p: 5-0! (played October 2015) Weaknesses of AlphaGo: pro view (about October 2015) • Too soft • Follows patterns, always mimicking • Does not understand concepts like value of sente • No understanding of complicated moves with delayed consequences Myungwan Kim 9p’s conclusion: needs lessons from humans! Lee Sedol 9p+ Guo Juan 5p Fan Hui 2p Dutch Champion 6d Leo Dorst 1k Figure from the Nature paper. AlphaGo in October (4p+?) Rank Beginner The Match: AlphaGo vs Lee Sedol 9p Lee Sedol 9p digitally meets Demis Hassabis CEO Lee Sedol 9p (+) • 33 years old, professional since 12-year old • Among top 5 in the world (now, still) • Invents new joseki moves in important games • Played one of history’s most original games (the ‘broken ladder’ game) sedol_laddergame.sgf • Very good reading skills, for a human • Can manage a game, and himself, very well • But: knew that there was 1M$ at stake • But: knew that he was playing a program (Dutch) Go Players’ Expectations 5-0 4-1 3-2 2-3 1-4 0-5 Source: Bob van den Hoek, http://deeplearningskysthelimit.blogspot.nl/ The Match: AlphaGo vs Lee Sedol Nice detail: Fan Hui was referee! Game 1 B: Lee Sedol W: AlphaGo Move 102 was dubbed ‘superhuman’ in the press Black resigns! Hassabis’ tweet after GAME 1 Lee Sedol: “I am in shock [but] I do not regret accepting this challenge. I failed in the opening… " Game 2 W: Lee Sedol B: AlphaGo Move 37 (a 5th line shoulder hit ) was ‘very surprising ’ White resigns! Game 3 Lee Sedol (B) resigns Move 32 was the ‘most beautiful move of the match’ to many 3-0 so the match was decided… Game 4 AlphaGo (B) resigns! Move 78 was the ‘divine move’ (but it does not actually work) 3-1 Lee was astounding AlphaGo missed the ‘Divine Move’… Game 5 Lee Sedol (B) resigns AlphaGo made a low-kyu blunder on the ‘tombestone squeeze’, but recovered final score 4-1 The Tombstone Squeeze http://senseis.xmp.net/?TwoStoneEdgeSqueeze Game 5 had 100 million live viewers! Characterization of the games • Game 1: shocking • Game 2: excitingly innovative • Game 3: just plain scary • Game 4: the amazing Lee Sedol • Game 5: AlphaGo’s superior blunder recovery AlphaGo receives 9-dan diploma Lee Sedol after AlphaGo • Became a popular star in Korea after the match due to his humility: “humanity did not lose – I lost” • AlphaGo ‘freed up’ Lee Sedol’s rating his playing style: over 20 years • New focus: reading over intuition AlphaGo after Lee Sedol AlphaGo’s rating over 1.4 years • It has become much stronger • Game 4 problem of ‘Divine Move’ was fixed indirectly • Aja Huang at US Go Congress: two stones stronger than top-pros, and may move beyond that • (But it is in a self-play realm where we can no longer calibrate well) Go after AlphaGo • Go evolved through the ages. (Yunguseng Dojang lecture at 15.03.2016) – Long ago -1700: 3rd line, local fights – Dosaku (1700): action at a distance – Go Seigen (1930s): 4th line , simultaneity – AlphaGo (2016): 5th line, questions conventions • We suspected there was more to learn about Go – but not that it would be this much, – and that it would make so much difference! • Has changed Go commentaries : ‘After AlphaGo, I dare not say that this is bad anymore’ --- ‘Maybe AlphaGo could tell us?’ • The community would like the bot, to analyze games! • Huge spike in Go material sales – many stores ran out… Go demonstrations • The rules are simple, you can play in 5 minutes • We have smaller boards, for easier games • We give you an initial advantage (‘ handicap’) • Come have a Go, it’s fun! We play on Fridays and Wednesdays www.goinamsterdam.nl www.gobond.nl .
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