Nanochess edit / delete

Miniature implementations of chess (he's done the IOCCC a few times, but there are more variants here).

to chess games ioccc obfuscated software ... on 18 September 2011

HGM's Chess Pages edit / delete

Various software for playing chess, including some extremely little C programs that nonetheless include most of the features of proper computer chess players. Most impressive.

to chess cute-code games software ... on 18 December 2009

Home page of The Chess Variant Pages edit / delete

Many ways to play chess -- or games to play with chess pieces.

to chess design games ... on 13 August 2006

John Savard's Home Page edit / delete

Splendidly diverse (and growing every time I come back to it).

to amusements chess electronics keyboards maps maths retrocomputing time video ... on 22 February 2006

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