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Stockfish

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'''[[Main Page|Home]] * [[Engines]] * Stockfish'''
[[FILE:stockfish-logo.png|border|right|thumb|| Stockfish logo <ref>The Stockfish icon was designed by [http://iamkle.in/ Klein Maetschke], [https://stockfishchess.org/about/ About - Stockfish]</ref> ]] [[FILE:stockfish12-logo.png|border|right|thumb|link=https://stockfishchess.org/| Stockfish 12 logo <ref>[https://stockfishchess.org/ Stockfish - Open Source Chess Engine], The Stockfish 12 icon was designed by [http://iamkle.in/ Klein Maetschke], [https://stockfishchess.org/about/ About - Stockfish]</ref> ]]
'''Stockfish''',<br/>
an [[UCI]] compatible [[:Category:Open Source|open source]] chess engine developed by [[Tord Romstad]], [[Marco Costalba]], [[Joona Kiiski]] and [[Gary Linscott]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=58779 Stockfish 7] by [[Joona Kiiski]], [[CCC]], January 02, 2016</ref>, licensed under the [[Free Software Foundation#GPL|GPL v3.0]]. Marco forked the project from version 2.1 of Tord's engine [[Glaurung]], first announced by Marco in November 8, 2008 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=24675 Stockfish 1.0] by [[Marco Costalba]], [[CCC]], November 02, 2008</ref>, and in early 2009 Joona's [[Smaug]], a further Glaurung 2.2 derivative, was incorporated <ref>[http://www.talkchess.com/forum/viewtopic.php?t=26971&start=1 Re: Smaug: a new chess engine based on glaurung] by [[Marco Costalba]], [[CCC]], March 12, 2009</ref> . Starting out among the top twenty engines, Stockfish has quickly climbed in [[Playing Strength|strength]] to become the world strongest chess entity as of 2018 - at least concerning the [[AlphaZero]] hype <ref>[[David Silver]], [[Thomas Hubert]], [[Julian Schrittwieser]], [[Ioannis Antonoglou]], [[Matthew Lai]], [[Arthur Guez]], [[Marc Lanctot]], [[Laurent Sifre]], [[Dharshan Kumaran]], [[Thore Graepel]], [[Timothy Lillicrap]], [[Karen Simonyan]], [[Demis Hassabis]] ('''2017'''). ''Mastering Chess and Shogi by Self-Play with a General Reinforcement Learning Algorithm''. [https://arxiv.org/abs/1712.01815 arXiv:1712.01815]</ref>, public available chess entity. The name "Stockfish" reflects the ancestry of the engine. Tord is Norwegian and Marco Italian, and there is a long history of [https://en.wikipedia.org/wiki/Stockfish stockfish] trade from Norway to Italy (to Marco's home town of [https://en.wikipedia.org/wiki/Vicenza Vicenza], in fact). Stockfish also referred another famous "little fish", the then strongest chess engine [[Rybka]].
In 2011. , Marco Costalba and Joona Kiiski stepped down as Stockfish maintainers <ref>[http://www.talkchess.com/forum/viewtopic.php?t=40610 Stockfish on github] by [[Marco Costalba]], [[CCC]], October 02, 2011</ref>. From that, the project is being developed and maintained by the [[:Category:Stockfish Contributor|Stockfish community]]. A synergy effect with the [[Shogi]] community led to the promising branch of [[Stockfish NNUE]], courtesy of [[Hisayori Noda|Nodchip]], who introduced [[NNUE]] to Stockfish in 2019 <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=74059 Stockfish NN release (NNUE)] by [[Henk Drost]], [[CCC]], May 31, 2020</ref>. On September 02, 2020, '''Stockfish 12''' was released with a huge jump in [[Playing Strength|playing strength]] due to NNUE and further [[Automated Tuning|tuning]] of the engine as a whole <ref>[https://blog.stockfishchess.org/post/628172810852925440/stockfish-12 Stockfish 12], The Stockfish Team, [https://blog.stockfishchess.org/ Stockfish Blog], September 02, 2020</ref>. The release of '''Stockfish 13''' on February 19, 2021, has been triggered by the start of sales of the [[Fat Fritz#Fat Fritz 2|Fat Fritz 2]] engine by [[ChessBase]], based on a recent development version of Stockfish with minor modifications <ref>[https://blog.stockfishchess.org/post/643570707142492160/stockfish-13 Stockfish 13], The Stockfish Team, February 19, 2021</ref>.
=Science versus Commerce?=
<span id="Matches"></span>
=GM+Rybka vs. Stockfish=
On July 19, 2014, Stockfish 5 played a four game match versus [https://en.wikipedia.org/wiki/Daniel_Naroditsky Daniel Naroditsky] plus [[Rybka|Rybka 3]] (2008), 45 minutes plus 30-second increment. Stockfish won 3½ - ½ <ref>[http://www.chess.com/article/view/how-rybka-and-i-tried-to-beat-the-strongest-chess-computer-in-the-world Can a GM and Rybka beat Stockfish?] by GM [https://en.wikipedia.org/wiki/Daniel_Naroditsky Daniel Naroditsky], [https://en.wikipedia.org/wiki/Chess.com [Chess.com]], August 08, 2014</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?t=53228 GM and Rybka vs. Stockfish] by Robert Maddox, [[CCC]], August 09, 2014</ref> . A few weeks later the experiment continued with [https://en.wikipedia.org/wiki/Hikaru_Nakamura Hikaru Nakamura] in [https://en.wikipedia.org/wiki/Burlingame,_California Burlingame, California] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=53315 Nakamura vs Stockfish, public match 8/23] by Jesse L, [[CCC]], August 17, 2014</ref> . Supported two games by Rybka 3, Nakamura lost ½ - 1½, two games with pawn odds (Stockfish both Black without h- and b-pawn) ended ½ - 1½ in favour to Stockfish 5 as well. It played the latest development build compiled for [[Mac OS|OS X]] running on a 3 GHz 8-Core [[Macintosh|Mac Pro]] <ref>[http://www.chess.com/news/stockfish-outlasts-nakamura-3634 Stockfish Outlasts "Rybkamura"] by [http://www.chess.com/article/view/chesscom-player-profiles-fm-mikeklein FM Mike Klein], [https://en.wikipedia.org/wiki/Chess.com [Chess.com]], August 24, 2014</ref> .
=Selected Features=
* [[Bitboards]] with [[Square Mapping Considerations#LittleEndianRankFileMapping|Little-Endian Rank-File Mapping (LERF)]]
* [[Magic Bitboards]]
: [[BMI2#PEXTBitboards|BMI2 - PEXT Bitboards]] (not recommend for [[AMD]] [https://en.wikipedia.org/wiki/Ryzen Ryzen] <ref>[https://www.reddit.com/r/Amd/comments/60i6er/ryzen_and_bmi2_strange_behavior_and_high_latencies/ Ryzen and BMI2: Strange behavior and high latencies] by DonnieTinyHands, [https://en.wikipedia.org/wiki/Reddit Reddit], March 20, 2017</ref>prior to [https://en.wikipedia.org/wiki/Zen_3 Zen 3])
* [[Piece-Lists]] <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=7&t=69364&start=12 Re: piece lists advantage with bit-boards?] by [[Ronald de Man]], [[CCC]], December 26, 2018</ref>
==[[Search]]==
* Stockfish 11 - January 18, 2020
* [[Stockfish NNUE|Stockfish 12]] - September 02, 2020
* Stockfish 13 - February 19, 2021
<span id="ports"></span>
=Ports=
* [[Crystal]]
* [[DON]]
* [[Eman]]
* [[Fat Fritz#Fat Fritz 2|Fat Fritz 2.0]]
* [[Houdini]]
* [[McBrain]]
* [http://www.talkchess.com/forum/viewtopic.php?t=66793 Elo measurement of contempt in SF in self-play] by [[Michel Van den Bergh]], [[CCC]], March 10, 2018 » [[Contempt Factor|Contempt]], [[Playing Strength]]
* [http://www.talkchess.com/forum/viewtopic.php?t=66935 Stockfish 180113 - Initial position until depth 65] by [[Andreas Strangmüller]], [[CCC]], March 27, 2018 » [[Initial Position]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=67932 Stockfish and serious hardware: 384 threads] by [[Jouni Uski]], [[CCC]], July 08, 2018 » [[Thread]]
* [https://groups.google.com/d/msg/fishcooking/kJ6vNKyp6h8/zwRnc-i7CwAJ Stockfish 10 - Call for Binaries] by [[Daylen Yang]], [[Computer Chess Forums|FishCooking]], November 29, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=69364&start=12 Re: piece lists advantage with bit-boards?] by [[Ronald de Man]], [[CCC]], December 26, 2018 » [[Piece-Lists]], [[asmFish]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=73753 Null move] by [[Robert Pope]], [[CCC]], April 24, 2020 » [[Null Move Pruning]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=74037 Stockfish_dev is probably stronger than Sargon 1978 v1.00] by [[Kai Laskos]], [[CCC]], May 29, 2020 » [[Sargon]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=74059 Stockfish NN release (NNUE)] by [[Henk Drost]], [[CCC]], May 31, 2020 » [[NNUE]], [[Stockfish NNUE]]* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74339 Stockfish has included WDL stats in engine output] by Deberger, [[CCC]], July 02, 2020 » [[Pawn Advantage, Win Percentage, and Elo]]
* [https://groups.google.com/d/msg/fishcooking/EBKQSrb9I08/5xasTnnSCAAJ stockfishNNUE vs others (TCEC 18 bonus)] by [[Warren D. Smith]], [[Computer Chess Forums|FishCooking]], July 14, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=74484 Can the sardine! NNUE clobbers SF] by [[Henk Drost]], [[CCC]], July 16, 2020 » [[Stockfish NNUE]]
* [https://groups.google.com/d/msg/fishcooking/yjh1YOxy7nw/rJA6u1ODAAAJ SF NNUE/Classical] by [[Fauzi Akram Dabat|Fauzi]], [[Computer Chess Forums|FishCooking]], October 05, 2020 » [[Stockfish NNUE]]
* <span id="i486Re"></span>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=63857&start=14 Re: Stockfish bench in i486 & Pentium 75mhz !] by [[Vincent Lejeune]], [[CCC]], October 11, 2020 » [[#i486|Stockfish bench ...]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=75841&start=8 Re: Raspberry Pi 4 compiled chess engines] by [[Rasmus Althoff]], [[CCC]], November 16, 2020 » [[Raspberry Pi]]
'''2021'''
* [https://groups.google.com/g/fishcooking/c/cad1MGSdpU4/m/Ury4iBqSBgAJ Shouldn't positional attributes drive SF's NNUE input features (rather than king position)?] by [[Nick Pelling]], [[Computer Chess Forums|FishCooking]], January 10, 2021 » [[Stockfish NNUE]]
* [https://groups.google.com/g/fishcooking/c/AzYDbbv-Coo Stockfish 13] by [[Joost VandeVondele]], [[Computer Chess Forums|FishCooking]], February 19, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76639 Stockfish 13 merged on github] by [[Joshua Shriver]], [[CCC]], February 19, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=76977 Setting up Stockfish on a server] by Jon12345, [[CCC]], March 29, 2021 » [[Chess Server]]
=External Links=
* [https://blog.stockfishchess.org/post/625828091343896577/introducing-nnue-evaluation Introducing NNUE Evaluation], August 07, 2020
* [https://blog.stockfishchess.org/post/628172810852925440/stockfish-12 Stockfish 12], The Stockfish Team, September 02, 2020
* [https://blog.stockfishchess.org/post/643570707142492160/stockfish-13 Stockfish 13], The Stockfish Team, February 19, 2021
==Testing==
* [https://stockfishchess.org/get-involved/ Get Involved - Stockfish - Powerful Open Source Chess Engine]
* [httphttps://tests.stockfishchess.org/tests Stockfish Testing Framework] » [[Stockfish#Fishtest|Fishtest]]
* [https://hxim.github.io/Stockfish-Evaluation-Guide/ Stockfish Evaluation Guide] » [[Stockfish#EvaluationGuide|Stockfish Evaluation Guide]]
* [https://groups.google.com/forum/#!forum/fishcooking FishCooking - Google Groups] a discussion group for developers and testers of [[Stockfish]] chess engine
* <span id="Support"></span>[http://support.stockfishchess.org/home Welcome - Stockfish Support]
* [https://github.com/glinscott/fishtest GitHub - glinscott/fishtest: Stockfish testing]
: [https://github.com/glinscott/fishtest/wiki/Creating-my-first-test Creating my first test· glinscott/fishtest Wiki · GitHub] by : [[Stephane Nicolet]https://github.com/glinscott/fishtest/wiki/Fishtest-mathematics Fishtest mathematics · glinscott/fishtest Wiki · GitHub]
* [https://github.com/zamar/spsa SPSA Tuner for Stockfish Chess Engine] » [[SPSA]]
* [https://groups.google.com/forum/#!forum/fishcooking FishCooking - Google Groups] a discussion group for developers and testers of [[Stockfish]] chess engine
==Rating Lists==
* [http://www.computerchess.org.uk/ccrl/4040/cgi/compare_engines.cgi?family=Stockfish&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents Stockfish] from [[CCRL|CCRL 40/15]]
* [http://computerchess.org.uk/ccrl/404/cgi/compare_engines.cgi?family=Stockfish&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents Stockfish] in [[CCRL|CCRL Blitz]]
==Matches==
* [http://www.chess.com/article/view/how-rybka-and-i-tried-to-beat-the-strongest-chess-computer-in-the-world Can a GM and Rybka beat Stockfish?] by GM [https://en.wikipedia.org/wiki/Daniel_Naroditsky Daniel Naroditsky], [https://en.wikipedia.org/wiki/Chess.com [Chess.com]], August 08, 2014 » [[Stockfish#Matches|GM+Rybka vs. Stockfish]]* [http://www.chess.com/news/stockfish-outlasts-nakamura-3634 Stockfish Outlasts "Rybkamura"] by [http://www.chess.com/article/view/chesscom-player-profiles-fm-mikeklein FM Mike Klein], [https://en.wikipedia.org/wiki/Chess.com [Chess.com]], August 24, 2014* [https://www.chess.com/news/view/alphazero-reactions-from-top-gms-stockfish-author AlphaZero: Reactions From Top GMs, Stockfish Author] by [http://www.chessvibes.com/?q=peterdoggers [Peter Doggers]], [https://en.wikipedia.org/wiki/Chess.com [Chess.com]], December 08, 2017 » [[AlphaZero#StockfishMatch|AlphaZero vs. Stockfish]]
==Interviews==
* [http://www.schach-welt.de/schach/computerschach/interviews/romstad-kiiski-costalba-eng Computerschach, Interview with Tord Romstad (Norway), Joona Kiiski (Finland) and Marco Costalba (Italy)] by [[Frank Quisinsky]], March 29, 2010

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