The world's smallest x86 chess program: a playable 16-bit DOS chess engine in 272 bytes with a four-ply search, reproducible builds and replayable Z3 proof evidence.
A UCI chess engine written from scratch, in one 24-hour session, by an AI model (Opus 5.5, Anthropic), working fully autonomously. The final engine is a bitboard/PEXT alpha-beta searcher with an NNUE ...
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