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• RetroCorner
  A website devoted to chess problems involving retrograde analysis.

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• ChessProblem.net
  A forum devoted to chess problems.

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• Tim Krabbé's Chess Curiosities

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• Juraj Lörinc's Chess Composition Microweb

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• British Chess Problem Society
  A good site for newcomers to chess problems.

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• Problemesis
  An online chess problem journal.

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• Chess Problems by Computer, by François Labelle
  Fascinating chess games and statistics on chess games discovered by computer.

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• Chess and Mathematics (12 page PostScript or PDF file)
  An excerpt (version of 1 November 1999) from a book I am writing with Noam Elkies.

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• Talk on chess and mathematics: (PostScript or pdf) (27 pages): the second lecture in a series of two lectures (the first given by Noam Elkies) at M.I.T. in January 13, 2000.
  

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• Queue problems revisited (12 page PostScript or pdf file): a paper on some chess problems related to enumerative combinatorics, to be published in Suomen Tehtäväniekat. The problems all have the stipulation "Serieshelpmate in n." In such a problem, Black moves first and makes n consecutive moves, after which White mates Black in one move. The players are cooperating to achieve this end. Black may not move into check and may not check White (except possibly on his last move).

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• Some of my problems (8 page PostScript or pdf file)

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