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Sargon: A Computer Chess Program, also known in-game as either Sargon Chess or Sargon I, is a digital chess game developed by Dan and Kathe Spracklen (along with Paul Lohnes for the TRS-80 version and Gary Shannon for the Apple II version) and published by Hayden Book Company for TRS-80 and Apple II (Platform) computers in 1979. One of the earliest chess programs for microcomputers, Sargon was notable for winning the first-ever microcomputer chess tournament at the 1978 West Coast Computer Faire, with its success leading to its source code (which ran on general Z80-based processors) being sold first as mail-order, then as a retail book. While there were unofficial adaptations of the game, Hayden Book Company (which published the book for the source code) released two conversions of the game, each with their own input and graphical implementations (including the option to modify the board freely). The game later received multiple sequels throughout the 1980's and early 1990's.