Helpmate
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- VARIANTIM Bulletin of the Israel Chess Composition Society
- Chess Problems out of the Box
- Complexity of Retrograde and Helpmate Chess Problems: Even Cooperative Chess Is Hard
- VARIANT CHESS 5 Page 49
- Fairy Definitions Click on the Term to Go to the Definition Fairy Pieces
- Official Rules of Chess, V 7Th Edition, 8-21-20
- The Problemist British Chess Problem Society
- 3 CPB Tourneys -...CHESSPROBLEMS.CA
- 5 Direct Mate Problems in Chess
- Towards ECV3
- A Glossary of Fairy Chess Definitions
- SOME PROBLEMS 22 January 2005
- Black to Play, a Retrospective Introduction by the Author (2012)
- The Mathematical Knight