Deep Sjeng actually tied for second place, however the winner, Rybka, was disqualified for plagiarism. Tournaments ĭeep Sjeng participated in six World Computer Chess Championships, then retired after tying for first place in the 17th Championship. The last version of Deep Sjeng won the World Computer Speed Chess Championship in 2008. It featured multiprocessor support and was estimated to be 200 rating points stronger than Sjeng Free. The next iteration of the chess engine was named Deep Sjeng 1.0 and released as a commercial program on. Several more versions were released culminating with version 12.13 on. Version 12.7 was released concurrently with version 11.2 on. Version 12 contained many changes, including a switch to bitboard architecture and the removal of variant support. With version 12 Sjeng went back to being closed source, although still free. The last open source version was Sjeng 11.2, released on. The first version with source code under the GPL was Sjeng 7 released to SourceForge on. Starting with Mac OSX 10.4 Sjeng has been distributed as the engine behind the graphical “ Chess” Mac application. Unlike most other chess engines Sjeng supports several popular chess variants: Crazyhouse, Suicide, Losers and, when playing on a chess server, Bughouse. According to the Sjeng website “Sjeng was written by Gian-Carlo Pascutto with help from Adrien Regimbald, Daniel Clausen, Dann Corbit, Lenny Taelman, Ben Nye, Ronald De Man, David Dawson, Tim Foden and Georg von Zimmermann.” The AUTHORS file in the Sjeng distribution states that “Sjeng is written by Gian-Carlo Pascutto, based on work done by Adrien Regimbald.”

Deep sjeng 3 x 4