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title: Deep Sjeng

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Deep Sjeng,

a private, and former commercial chess engine by Gian-Carlo Pascutto, which emerged in 2002 from the 12.7 closed source branch of the chess variant and chess playing open source engine Sjeng [1] . Opposed to other commercial engines with the surename "deep" to indicate the version is able to play on multiple processors and sold for almost the double price than their "none deep" counterparts, Deep Sjeng, albeit able to play on multiple cores as well, is the native engine name for single as well as multiple processors. Deep Sjeng was market since 2003 by Lex Loep's company Lokasoft [2] . It came with the ChessPartner graphical interface and supports UCI and the Chess Engine Communication Protocol. Version 2.X with the Mayura Chess Board [3] and its third incarnation Deep Sjeng 3.x were distributed via Gian-Carlo's own site, but Deep Sjeng is no longer for sale [4] .

Tournaments

Deep Sjeng played many computer chess tournaments. It participated (so far) at six World Computer Chess Championships [5] :

| Edition | Tournament | Ranking | Participants | Score | Games | | --- | --- | --- | --- | --- | --- | | 11th | WCCC 2003 | Graz | 11 | 16 | 4.5 | 11 | | 12th | WCCC 2004 | Ramat Gan | 10 | 14 | 5.5 | 11 | | 13th | WCCC 2005 | ReykjavΓ­k | 3 | 12 | 7.5 | 11 | | 15th | WCCC 2007 | Amsterdam | 6 | 11 | 6 | 11 | | 16th | WCCC 2008 [6] | Beijing | 8 | 10 | 3.5 | 9 | | 17th | WCCC 2009 [7] | Pamplona | 1 | 9 | 6.5 | 9 |

Deep Sjeng further played various Dutch Open Computer Chess Championships, International CSVN Tournaments, Livingston Chess960 Computer World Championships, dominated The Chess Programmers Tournament with three wins so far from four editions, and won the Italian IOCSC 2010. Online Deep Sjeng played multiple CCT Tournaments, where Deep Sjeng won the CCT12 in 2010 and CCT13 in 2011. Since 2008, Deep Sjeng participated the ACCA World Computer Rapid Chess Championship always with top rankings, winning the WCRCC 2012.

Screenshot

Deep Sjeng 2.5 with Mayura Chess Board [8]

Parallel Search

Gian-Carlo Pascutto in a reply to Georg von Zimmermann on Deep Sjeng's parallel search [9] :

How is Deep Sjeng going? What did you use to understand the parallel algorithms you are using (which ones) ?

I started out with [ABDADA](ABDADA "ABDADA") (described in ICCA journal article and used in [Amy](Amy "Amy")), which got me a speedup of +- 1.2. I went on to try [PVS](Parallel_Search#PrincipalVariationSplitting "Parallel Search") ([Crafty 15.0](Crafty "Crafty") and described in several articles about parallel search) which got me a speedup of 1.2-1.3.


1.3 wasn't enough, so I 'bit the bullent' and started looking at [DTS](Dynamic_Tree_Splitting "Dynamic Tree Splitting") ([Cray Blitz](Cray_Blitz "Cray Blitz")). Unfortunately, DTS is both hideously complicated and requires a [nonrecursive search](Iterative_Search "Iterative Search") and a [p2p design](https://en.wikipedia.org/wiki/Point-to-point_%28network_topology%29#Point-to-point). I spent some time working on a variant of DTS that can work with a [recursive](Recursion "Recursion") search function and a [master-slave design](https://en.wikipedia.org/wiki/Master/slave_%28technology%29) and that is what I am using now. It still needs a lot of test work, but current results indicate a speedup of about 1.6.

Automated Learning

In 2007, Gian-Carlo's experimental program Stoofvlees aka Deep Sjeng 2.7 [10] with a set of feature recognizers coupled to a neural network [11], had its evaluation function entirely automatically learned from "watching" Grandmaster games. The results were incorporated into Deep Sjeng 3.0 [12]. The engine has noticeably improved in strength, particularly in the areas where it was less optimal before.

Forum Posts

External Links

References

  1. ↑ Sjeng 12.7 and 11.2 released by Gian-Carlo Pascutto, rgcc, January 2, 2002
  2. ↑ Deep Sjeng 1.0 released by Lex, rgcc, March 3, 2003
  3. ↑ SJENG.ORG - Deep Sjeng 2.x
  4. ↑ SJENG.ORG - Deep Sjeng 3.x
  5. ↑ Sjeng's ICGA Tournaments (mostly Deep Sjeng)
  6. ↑ Deep Sjeng played the WCCC 2008 under the name Sjeng, not to confused with the "old" Sjeng
  7. ↑ After the disqualification of Rybka in June 2011, shared Champion with Shredder and Junior
  8. ↑ Deep Sjeng 2.x - Screenshots
  9. ↑ Re: Deep Sjeng testers wanted by Gian-Carlo Pascutto, CCC, August 29, 2002
  10. ↑ Deep Sjeng 2.7 released by Jens, CCC, September 03, 2007
  11. ↑ Re: Chess program with Artificial Neural Networks (ANN)? by Gian-Carlo Pascutto, CCC, January 07, 2010
  12. ↑ Re: Chess program with Artificial Neural Networks (ANN)? by Gian-Carlo Pascutto, CCC, January 08, 2010

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