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 [1] . 1K ZX Chess was commercially market by the author himself [2], and soon by Artic Computing [3] [4] , a software development company set up by Richard Turner [5] and Chris Thornton [6] , a chess programmer himself, and author of Spectrum Chess [7] , which competed at the European MCC 1982 and 1983, and Turbo Chess for the ZX Spectrum [8] . 1K ZX Chess was further released by Sinclair Research in 1982 [9] . 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 includes these moves [10] .
Artic Cover [11]

Screenshot

1K ZX Chess [12]

See also

• Spectrum Chess
• SuperChess
• ZX Chess
• ZX Spectrum Chess

Publications

• Brendon Gore (1982). Interview-One Degree In Artic. Your Computer, May 1982
• 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)

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
• The greatest program ever written | kuro5hin.org, Aug 10, 2001
• 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 ^[13]
• The world's smallest chess engines by Albert Silver, ChessBase News, September 23, 2015 » 1K ZX Chess, BootChess, Toledo Nanochess, Micro-Max

References

1. ^ David Horne (1983). Full ZX-81 Chess in 1K. Your Computer, February 1983
2. ^ Magazine Page Scan from World of Spectrum, June 1982
3. ^ Magazine Page Scan from World of Spectrum, July 1982
4. ^ ZX81 Cassette Tape Information for 1K ZX Chess (Artic)
5. ^ Brendon Gore (1982). Interview-One Degree In Artic. Your Computer, May 1982
6. ^ Artic Software from Wikipedia
7. ^ Chris A. Thornton - World of Spectrum
8. ^ Turbo Chess - World of Spectrum
9. ^ ZX81 Cassette Tape Information for 1K ZX Chess
10. ^ Retrogaming Times Monthly - Issue #56 - January 2009
11. ^ ZX81 Cassette Tape Information for 1K ZX Chess (Artic)
12. ^ ZX81 Cassette Tape Information for 1K ZX Chess
13. ^ Re: Old programs CHAOS and USC by Dann Corbit, CCC, July 11, 2015

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