![]() Let Stockfish ponder its next move while the opponent is thinking. ![]() It is recommended to set Hash after setting Threads. For best performance, set this equal to the number of CPU cores available. The number of CPU threads used for searching a position. > setoption name Threads value 6 > setoption name SyzygyPath value C:\Chess\tb\tb345 C:\Chess\tb\wdl6 C:\Chess\tb\wdl7 > setoption name UCI_ShowWDL value true > setoption name Clear Hash One string will be sent for each parameter and this will only be sent when the engine is waiting. This is sent to the engine when the user wants to change the internal parameters of the engine. We invite our chess fans to join the Fishtest testing framework and programmers to contribute to the project.> uci id name Stockfish 15.1 id author the Stockfish developers (see AUTHORS file) option name Debug Log File type string default option name Threads type spin default 1 min option name Hash type spin default option name Clear Hash type button option name Ponder type check default false option name MultiPV type spin default 1 min 1 max 500 option name Skill Level type spin default 20 min 0 max 20 option name Move Overhead type spin default 10 min option name Slow Mover type spin default 100 min option name nodestime type spin default 0 min 0 option name UCI_Chess960 type check default false option name UCI_AnalyseMode type check default false option name UCI_LimitStrength type check default false option name UCI_Elo type spin default 1 option name UCI_ShowWDL type check default false option name SyzygyPath type string default option name SyzygyProbeDepth type spin default 1 min 1 max 100 option name Syzygy50MoveRule type check default true option name SyzygyProbeLimit type spin default 7 min 0 max 7 option name Use NNUE type check default true option name EvalFile type string default nn-ad9b42354671.nnue uciok setoption Indeed, the Stockfish project builds on a thriving community of enthusiasts to offer a free and open-source chess engine that is robust, widely available, and very strong. This work by Pasquale Pigazzini, Tom Vijlbrief, Michel Van den Bergh, and various other developers is an essential part of the success of the Stockfish project. ![]() In the last few years, our distributed testing framework, Fishtest, has been operated superbly and has been developed and improved extensively. To perform these tests, contributors provide CPU time for testing, and in the last year, they have collectively played roughly a billion chess games. These include the fourth generation of our NNUE network architecture, as well as various search improvements. For Stockfish 15, we tested nearly 13000 different changes and retained the best 200. This progress is the result of a dedicated team of developers that comes up with new ideas and improvements. At TCEC, Stockfish won the Season 21, Cup 9, FRC 4 and in the current Season 22 superfinal, at the time of writing, has won 16 game pairs and not yet lost a single one. At CCC, Stockfish won all of the latest tournaments: CCC 16 Bullet, Blitz and Rapid, CCC 960 championship, and the CCC 17 Rapid. Improvements to the engine have made it possible for Stockfish to end up victorious in tournaments at all sorts of time controls ranging from bullet to classical and even at Fischer random chess. In our testing, Stockfish 15 is ahead of Stockfish 14 by 36 Elo points and wins nine times more game pairs than it loses. Stockfish 15 continues to push the boundaries of chess, providing unrivalled analysis and playing strength. A new major release of Stockfish is now available at
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