p4wn
p4wn was originally written by Douglas Bagnall in 2002 for the 5K competition, a competition where the goal was to create something cool in less than 5 kilobytes. Lots of great things came out of this, one of them was this chess game.
The game has its own SourceForge page and several improved versions have been made since the original. I believe the best version is the one pictured above, made by Sven Vahar in 2004. It has a nice and pretty board and features three different CPU opponent levels.
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