Home * Engines * Stockfish
Lofoten_Reine_Stockfish.jpg

Stockfish,
an UCI compatible open source chess engine developed by Tord Romstad, Marco Costalba, Joona Kiiski, and Gary Linscott [1] . Marco forked the project from version 2.1 of Tord's strong engine Glaurung, first announced by Marco in November 8, 2008 [2] , and in early 2009 Joona's Smaug, a further Glaurung 2.2 derivative, was incorporated [3] . Starting out among the top twenty engines, Stockfish has quickly climbed in strength. The name "Stockfish" reflects the ancestry of the engine. Tord is Norwegian and Marco Italian, and there is a long history of stockfish trade from Norway to Italy (to Marco's home town of Vicenza, in fact). Stockfish also references another famous "little fish", Rybka.
Stockfish in Reine, Lofoten [4]

Science versus Commerce?

There is a wide range of opinions about strong open source chess engines affecting commercial and competitive interests, as well as monetary interests from computer chess users, who obtain a top engine for free. The scientific and social value of strong open source programs is indisputable. The teamwork effort to share ideas and knowledge to write one of the strongest programs, which everybody may follow and share to learn and play for free, is definitely a challenging and motivating task, gathering both admiration and enviousness. Obviously, professional programmers of commercial chess programs are not that enthusiastic about the development, and need to improve further and/or focus more on secondary features or other business concepts like on-line play and/or user interface issues rather than on pure playing strength.

Also many hobbyist chess programmers feel in antagonism as well, not only caused by Stockfish with its highly respected authors, and before by Fruit and slightly Crafty, but from Ippolit and all its successors by pseudonymous authors and disputed origin. The implications on commercial and competitive computer chess are not quite clear, but presumably the decrease in number of participants of over the board tournaments will progress and clone suspicions may float like a Sword of Damocles over the scene, whether programmers took ideas too literally or not.

Fishtest

The Stockfish Testing Framework called Fishtest [5] is a web application written by Gary Linscott [6] [7] mainly in Python under the Pyramid Application Development Framework [8] , to distribute games across different machines to reduce the test latency and increment throughput. Started in early 2013 with Stockfish 3.0, Fishtest has hundreds of contributors, as of May 2014, 744 testers and 52 developers [9] active in testing ideas and tweaks [10] , to make Stockfish the strongest open source or even chess program of the world [11] .

Evaluation Guide

Since April 2017 the interactive Stockfish Evaluation Guide is available to explore Stockfish's evaluation with a JavaScript implementation running in a browser [12] . One may enter a FEN string of a position, to get the resulting score of the main evaluation term considering the game phases within its tapered evaluation, and may navigate through the tree of subterms and features with its particular characteristics for the given position [13] .

Tournament Play

Stockfish is top contender of the prestigious Thoresen Chess Engines Competition (TCEC), reaching the superfinals since season 4, losing season 4 from Houdini and season 5 from Komodo TCEC, both narrow matches with 23 - 25, but won the season 6 superfinal versus Komodo 7 conveniently with +13=45-6 and 35½ - 28½. Successor Stockfish 141214 qualified for the TCEC Season 7 Superfinal in December 2014, versus Komodo again, this time with the better end for Komodo 8 successor 1333 with 33½ - 30½. About one year later at TCEC Season 8, again Komodo and Stockfish qualified for the TCEC Season 8 Superfinal, finished with 53½ - 46½ in favour to Komodo 9.3x [14] , but in the following year Stockfish 8 won the superfinal conveniently this time versus the new Houdini 5 with 54½ - 45½.
.

GM+Rybka vs. Stockfish

On July 19, 2014, Stockfish 5 played a four game match versus Daniel Naroditsky plus Rybka 3 (2008), 45 minutes plus 30-second increment. Stockfish won 3½ - ½ [15] [16] . A few weeks later the experiment continued with Hikaru Nakamura in Burlingame, California [17] . 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 OS X running on a 3 GHz 8-Core Mac Pro [18] .

Selected Features

[19]

Board Representation

Search

Evaluation

[21] [22]

Misc


Release Dates

  • Stockfish 1.0 : November 02, 2008
  • Stockfish 1.01 : November 03, 2008
  • Stockfish 1.1 : December 06, 2008
  • Stockfish 1.1a : December 08, 2008
  • Stockfish 1.2 : December 29, 2008
  • Stockfish 1.3 : May 02, 2009
  • Stockfish 1.3.1 : May 03, 2009
  • Stockfish 1.4 : July 05, 2009
  • Stockfish 1.5 : October 04, 2009
  • Stockfish 1.5.1 : October 11, 2009
  • Stockfish 1.6 : December 25, 2009
  • Stockfish 1.6.1 : December 25, 2009
  • Stockfish 1.6.2 : December 31, 2009
  • Stockfish 1.6.3 : February 02, 2010
  • Stockfish 1.7 : April 08, 2010
  • Stockfish 1.7.1 : April 10, 2010
  • Stockfish 1.8 : July 02, 2010
  • Stockfish 1.9 : October 02, 2010
  • Stockfish 1.9.1 : October 05, 2010
  • Stockfish 2.0 : January 01, 2011
  • Stockfish 2.0.1 : January 04, 2011
  • Stockfish 2.1 : May 04, 2011
  • Stockfish 2.1.1 : May 08, 2011
  • Stockfish 2.2 : December 29, 2011
  • Stockfish 2.2.1 : January 06, 2012
  • Stockfish 2.2.2 : January 14, 2012
  • Stockfish 2.3 : September 15, 2012
  • Stockfish 2.3.1 : September 22, 2012
  • Stockfish 3 : April 30, 2013
  • Stockfish 4 : August 20, 2013
  • Stockfish DD : November 29, 2013
  • Stockfish 5 : May 31, 2014
  • Stockfish 6 : January 27, 2015
  • Stockfish 7 : January 02, 2016
  • Stockfish 8 : November 01, 2016

Ports & Forks


See also


Publications


Videos


Forum Posts

2008

2009

2010

2011

2012

2013

2014

2015

2016

2017


External Links

Chess engine


Rating Lists

Matches

Interviews

Misc


References

  1. ^ Stockfish 7 by Joona Kiiski, CCC, January 02, 2016
  2. ^ Stockfish 1.0 by Marco Costalba, CCC, November 02, 2008
  3. ^ Re: Smaug: a new chess engine based on glaurung by Marco Costalba, CCC, March 12, 2009
  4. ^ Lofoten - Seeing is believing - The fisheries
  5. ^ glinscott/fishtest · GitHub
  6. ^ Get Involved - Stockfish - Powerful Open Source Chess Engine
  7. ^ Fishtest Distributed Testing Framework by Marco Costalba, CCC, May 01, 2013
  8. ^ The Pyramid Web Framework — The Pyramid Web Framework v1.5
  9. ^ Stockfish Testing Framework - Users
  10. ^ Stockfish Testing Framework
  11. ^ Adam's Computer Chess Pages: Stockfish Progression by Adam Hair
  12. ^ Re: How far away are we from deep learning Stockfish, Komodo by Gary, CCC, May 21, 2017
  13. ^ Stockfish Evaluation Guide
  14. ^ Soccer-like chess by Marco Costalba, CCC, November 29, 2015
  15. ^ Can a GM and Rybka beat Stockfish? by GM Daniel Naroditsky, Chess.com, August 08, 2014
  16. ^ GM and Rybka vs. Stockfish by Robert Maddox, CCC, August 09, 2014
  17. ^ Nakamura vs Stockfish, public match 8/23 by Jesse L, CCC, August 17, 2014
  18. ^ Stockfish Outlasts "Rybkamura" by FM Mike Klein, Chess.com, August 24, 2014
  19. ^ based on the sources of Stockfish 6
  20. ^ Re: Stockfish 7 progress by Lucas Braesch, CCC, January 17, 2016
  21. ^ See also Evaluation Philosophy and The Art of Evaluation by Tord Romstad, CCC, August 2, 2007
  22. ^ Stockfish Evaluation Guide
  23. ^ exoticorn/stockfish-js · GitHub
  24. ^ Part 1 covers Houdini, Rybka, Komodo, Stockfish, Critter, Naum, Chiron and Spike
  25. ^ Who is the Master? from Jean-Marc Alliot's professional website
  26. ^ exoticorn/stockfish-js · GitHub
  27. ^ Delphil 3.3b2 (2334) - Stockfish 030916 (3228), TCEC Season 9 - Rapid, Round 11, September 16, 2016
  28. ^ Regan's latest: Depth of Satisficing by Carl Lumma, CCC, October 09, 2015

What links here?


Up one Level