In TCEC Season 7, Stockfish again made the Superfinal, but lost it to Komodo with the score of 30.5-33.5. Stockfish 5 was released the following day. On, Stockfish 170514 (a development version of Stockfish 5 with tablebase support) convincingly won TCEC Season 6, scoring 35.5-28.5 against Komodo 7x in the Superfinal. In his honor, the version of Stockfish that was released shortly after that season was named "Stockfish DD". Season 5 was notable for the winning Komodo team as they accepted the award posthumously for the program's creator Don Dailey, who succumbed to an illness during the final stage of the event. In 2013 Stockfish finished runner-up at both TCEC Seasons 4 and 5, with Superfinal scores of 23-25 first against Houdini 3 and later against Komodo 1142. Competition results Participation in TCEC After the inception of Fishtest, Stockfish incurred an explosive growth of 120 Elo points in just 12 months, propelling it to the top of all major rating lists. Tests on the framework are verified using the chi-squared test, and only if the resulting p-value is not statistically significant, the test is deemed reliable.Īs of January 2016, the framework has used a total of more than 360 years of CPU time to play more than 240 million chess games.
STOCKFISH CHESS LATEST VERSION CODE
Since 2013, Stockfish is being developed using a distributed testing framework named Fishtest, where volunteers are able to donate CPU time for testing improvements to the program.Ĭhanges to game-playing code are accepted or rejected based on results of playing of tens of thousands of games on the framework against an older version of the program, using sequential probability ratio testing. An official repository, managed by a volunteer group of core Stockfish developers, was created soon after and currently manages the development of the project. On 18 June 2014 Marco Costalba announced that he had "decided to step down as Stockfish maintainer" and asked that the community create a fork of the current version and continue its development. The last Glaurung version 2.2 was released in December 2008.Īround 2011, Romstad decided to abandon his involvement with Stockfish and preferred to spend his time on his new iOS chess app. For a while, new ideas and code changes were transferred between the two programs in both directions, until Romstad decided to discontinue Glaurung in favor of Stockfish, which was the more advanced engine at the time. The first version, Stockfish 1.0 was released in November 2008. He named it Stockfish because it was " produced in Norway and cooked in Italy" (Costalba is an Italian, Romstad is a Norwegian). Four years later, Costalba, inspired by the strong open source engine decided to fork the project. The program originated from Glaurung, an open source chess engine created by Romstad and first released in 2004. The Syzygy tablebase support, previously available in a fork maintained by Ronald de Man, was integrated into Stockfish in 2014. Stockfish supports Chess960, which is one of the features that was inherited from Glaurung. Compared to other engines, it is characterized by its great search depth, due in part to more aggressive pruning and late move reductions. Stockfish implements an advanced alpha-beta search and uses bitboards.
The maximum size of its transposition table is 1 TB. Stockfish can use up to 128 CPU cores in multiprocessor systems.
It is derived from Glaurung, an open source engine by Romstad. It won the unofficial world computer chess championships in 2013 and was a runner-up in 20. Stockfish is consistently ranked first or near the top of most chess engine rating lists and is the strongest open source chess engine in the world. It is developed by Tord Romstad, Marco Costalba and Joona Kiiski, with many contributions from a community of open source developers. Stockfish is an open source UCI chess engine, available for various desktop and mobile platforms. Home :: Chess :: Computer chess Stockfish - chess
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