AttoChess, a complete, playable chess program for 16-bit x86 DOS in 278 bytes
Summary
AttoChess is a complete 278-byte DOS (.COM) chess program that draws the board, reads a move, and performs a four-ply minimax search. It is a size-optimized descendant of LeanChess, released under MIT, and demonstrates aggressive code golfing while maintaining a playable game in a highly constrained environment.