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an [[:Category:Open Source Engines|open source chess program]] by [[John Stanback]], written in [[C]] and published in May 1987 at [[Computer Chess Forums|comp.sources.games]] <ref>[https://groups.google.com/d/msg/comp.sources.games/zs_1mrpdseE/YL2yGrzoXrEJ v01i023: chess - C source for chess] by [[John Stanback]], [[Computer Chess Forums|comp.sources.games]], May 21, 1987</ref>. SCP later evolved to [[GNU Chess|GNU Chess 2-4]], and was also ported to the [[Amiga]] as ''Chess'' and ''Chess 2.0'', the latter with a mouse-driven [[GUI]] <ref>[http://www.mobygames.com/game/amiga/chess-20 Chess 2.0 for Amiga (1989)], [https://en.wikipedia.org/wiki/MobyGames MobyGames]</ref>. A [[WinBoard]] compatible version of SCP was most recently updated by [[Jim Ablett]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=29106 SCP/Gnuchess 2.02 JA by John Stanback - Update] by [[Jim Ablett]], [[CCC]], July 25, 2009</ref>, hosted by [[Kirill Kryukov]] <ref>[http://kirr.homeunix.org/chess/engines/Jim%20Ablett/SCP/ SCP] maintained and updated by [[Jim Ablett]], hosted by [[Kirill Kryukov]]</ref>.

SCP seems to originate the [[Repetitions|repetition]] counting algorithm, also found in some [[GNU Chess]] versions, [[TSCP]] <ref>[https://www.stmintz.com/ccc/index.php?id=119911 Re: Detecting three-fold repetition?] by [[John Stanback]], [[CCC]], July 17, 2000</ref>, and [[Belzebub]]. It may detect false repetitions in case of exchanging two unequal pieces <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=490672&t=45846 Re: Move Tables - explain as if I'm five] by [[Karlo Balla|Karlo Bala Jr.]], [[CCC]], November 05, 2012</ref>.