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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|user interface]], as published with listing in [[Your Computer]], February 1983 <ref>[[David Horne]] ('''1983'''). ''[http://users.ox.ac.uk/~uzdm0006/scans/1kchess/ Full ZX-81 Chess in 1K]''. [[Your Computer]], February 1983</ref> . 1K ZX Chess was commercially market by the author himself <ref>[http://zx81stuff.org.uk/zx81/showmag.php?mag=SinclairUser/Issue003/Pages/SinclairUser00300061.jpg Magazine Page Scan from World of Spectrum, June 1982]</ref>, and soon by [[Artic Computing]] <ref>[http://www.zx81stuff.org.uk/zx81/showmag.php?mag=SinclairUser/Issue004/Pages/SinclairUser00400044.jpg Magazine Page Scan from World of Spectrum, July 1982]</ref> <ref>[http://www.zx81stuff.org.uk/zx81/generated/tapeinfo/0/1KZXChess%28Artic%29.html ZX81 Cassette Tape Information for 1K ZX Chess] (Artic)</ref> , a software development company set up by Richard Turner and [[Chris A. Thornton]] <ref>[https://en.wikipedia.org/wiki/Artic_Software Artic Software from Wikipedia]</ref> , a chess programmer himself, and author of [[Spectrum Chess]] <ref>[http://www.worldofspectrum.org/infoseekpub.cgi?regexp=%5EChris+A.+Thornton$&loadpics=1 Chris A. Thornton - World of Spectrum]</ref> , which competed at the [[European MCC 1982]] and [[European MCC 1983|1983]], and [[Turbo Chess (GB)|Turbo Chess]] for the [[ZX Spectrum]] <ref>[http://www.worldofspectrum.org/infoseekid.cgi?id=0005457 Turbo Chess - World of Spectrum]</ref> .