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an open source engine 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 [1]. Sjeng was initially based on Faile 0.6 by Adrien Regimbald [2], and an attempt to create a Bughouse & Crazyhouse playing program. Sjeng 7 became open source under the GPL, also playing standard and Antichess [3].

The Chess Engine Communication Protocol compliant Sjeng 11.2 was the final open source program released in January 2002 [4], while Sjeng 12.7 was closed source, didn't play variants, and emerged to the commercial Deep Sjeng in 2003, initially market by Lex Loep's Lokasoft [5]. In it's suicide and loser's mode, Sjeng applies Proof-number search. Otherwise it uses Alpha-Beta with Aspiration Window and PVS, History and Killer heuristics, Transposition tables, SEE for move ordering and pruning, selective extensions, Adaptive Null Move Pruning, Extended Futility Pruning, Limited Razoring, and Book learning [6]. Sjeng is the engine of Apple's chess application as shipped in MacOS X 10.4 [7] [8] [9].


The name Sjeng, which is also a Limburgish masculine given name, is the reverse of the long time number one human Bughouse player, with the handle "Gnejs" [10] [11].

See also

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  1. ^ Sjeng : a chess-and-variants playing program - 7. Who wrote Sjeng ?
  2. ^ Re: Dutch CC all games available by Gian-Carlo Pascutto, CCC, November 04, 2001
  3. ^ ICGA: Losing Chess by Guy Haworth
  4. ^ Sjeng 12.7 and 11.2 released by Gian-Carlo Pascutto, rgcc, January 2, 2002
  5. ^ Deep Sjeng 1.0 released by Lex, rgcc, March 3, 2003
  6. ^ Sjeng Download - Readme
  7. ^ Chess (application) from Wikipedia
  8. ^ Chess - Source Browser
  9. ^ README
  10. ^ Yes, there are by Georg von Zimmermann, CCC, June 01, 2003
  11. ^ Eric van Reem (2001). Tiger und Rebel gleichauf in Leiden. Computerschach und Spiele, 6/2001 (German)

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