1K ZX Chess

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1K ZX Chess, a chess program for the Sinclair ZX81, written in 1982 by David Horne in Z80 Assembly with a code size of 672 bytes, including the user interface, as published with listing in Your Computer, February 1983. 1K ZX Chess was commercially market by the author himself, and soon by Artic Computing , a software development company set up by Richard Turner and Chris A. Thornton , a chess programmer himself, and author of Spectrum Chess , which competed at the European MCC 1982 and 1983, and Turbo Chess for the ZX Spectrum.

1K ZX Chess was further released by Sinclair Research in 1982. The program could only play white starting either with 1.e4 or 1.d4. Castling, promotions and en passant were not implemented, while a version for the unexpanded 2K Timex Sinclair 1000 include these moves.

=Screenshot= 1K ZX Chess

=See also=
 * Spectrum Chess
 * SuperChess
 * ZX Chess
 * ZX Spectrum Chess

=Publications=
 * David Horne (1982). Chess in 1K. Your Computer, December 1982
 * David Horne (1983). ZX-81 Chess. Your Computer, January 1983
 * David Horne (1983). Full ZX-81 Chess in 1K. Your Computer, February 1983

=Forum Posts=
 * World smallest chess program by Óscar Toledo Gutiérrez, comp.lang.c, November 22, 2006
 * Turnier: Schachcomputer vergleich zu alte Computerschach Spiele by Spacious Mind, Schachcomputer.info Forum, August 12, 2008 (German)
 * 1k zx chess sources question by Maksim Korzh, CCC, July 21, 2021

=External Links=
 * 1K ZX Chess from Wikipedia
 * 1K ZX81 Chess Z80 Assembly listing © Copyright David Horne
 * ZX81 Publisher Information for D. R. Horne
 * Magazine Page Scan from World of Spectrum, June 1982


 * ZX81 Cassette Tape Information for 1K ZX Chess (Artic)
 * Magazine Page Scan from World of Spectrum, July 1982


 * ZX81 Cassette Tape Information for 1K ZX Chess
 * 1K ZX Chess for ZX81 (1982), MobyGames
 * 1K Chess Showdown - malevolent design weblog
 * Computer Schach by Andre Adrian (German)
 * Classic Computer Chess - ... The programs of yesteryear by Carey, hosted by the Internet Archive
 * The world's smallest chess engines by Albert Silver, ChessBase News, September 23, 2015 » 1K ZX Chess, BootChess, Toledo Nanochess, Micro-Max

=References= Up one Level