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the [[:Category:Open Source Engines|open source chess engine]] of the [[Free Software Foundation]]. GNU Chess was initially written by [[Stuart Cracraft]] in the mid 80s, joined by [[John Stanback]] who contributed his [[SCP|own code]] to GNU Chess 2 and 3 which was laboriously and meticulously well-written <ref>[https://groups.google.com/d/msg/gnu.chess/KChQhVPAACA/ApFk4OeWlcYJ Re: request ...] by [[Stuart Cracraft]], [[GNU Chess#NewsGroup|gnu.chess]], June 16, 1995</ref>. Dozens of developers have enhanced GNU Chess over the times. Version 5 was a complete rewrite by [[Chua Kong Sian]], incorporating his chess program [[Cobalt]] and Cracraft's [[Gazebo]] <ref>[https://github.com/heisencoder/gnuchess/blob/master/src/common.h gnuchess/common.h at master · heisencoder/gnuchess · GitHub]</ref>. [[Fabien Letouzey]] is the primary author of GNU Chess 6, based on [[Fruit|Fruit 2.1]] <ref>[http://www.gnu.org/software/chess/chess.html GNU Chess - Free Software Foundation]</ref>.

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