1K ZX Chess (ZX81)

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Description

1K ZX Chess is a single-player chess game. Certain rules are omitted (castling, en passant capture, pawn promotion), as the code fits under one kilobyte (hence the title). The computer plays White with either of the two opening moves included.

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Trivia

Record

For over 30 years this program held the record of the smallest playable computer chess program (with 672 bytes). In 2015 this record was broken by Red Sectors program BootChess, which only required 487 bytes for a basic chess program including computer opponent.

Related Web Sites

• Scan of the original article in 'Your Computer' (1983) (Including the full source code of the game.)