CentralNotice 1K ZX Chess From Wikipedia, the free encyclopedia Jump to: navigation , search 1K ZX Chess Cover of Artic Computing's 1K ZX Chess Designer(s) David Horne Platform(s) Sinclair ZX81 Release date(s) 1983 Genre(s) Turn-based strategy Mode(s) Single-player 1K ZX Chess is a 1982 chess-playing computer program [ dubious – discuss ] for the unexpanded Sinclair ZX81 . 1 Description 2 Reception 3 See also 4 References 5 External links § Description [ edit ] 1K ZX Chess uses only 672 bytes of RAM [ 1 ] but implements most chess rules ( castling , promotion , and en passant capture are missing), and a computer opponent. [ 2 ] It was the smallest implementation of chess on any computer until its record was broken in January 2015 by the smallest completely new PC compatible BootChess , [ 3 ] although apparently artificial inte...