![]() ![]() We invite our chess fans to join the Fishtest testing framework and programmers to contribute to the project. 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. ![]() In our testing, Stockfish 15 is ahead of Stockfish 14 by 36 Elo points and wins nine times more game pairs than it loses. 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. Stockfish 15 continues to push the boundaries of chess, providing unrivalled analysis and playing strength. In the new version, two evaluation functions are available. 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 12 c ombines the brute-force computing approach of traditional Stockfish with the advanced evaluation capabilities of neural network chess engines such as AlphaZero and Leela Chess Zero. Stockfish 15 continues to push the boundaries of chess, providing unrivalled analysis and playing strength. Stockfish is a free and strong UCI chess engine derived from Glaurung 2.1 that analyzes chess positions and computes the optimal moves. Stockfish on GitHub Run Anywhere You can use Stockfish on your computer or on your iOS or Android device. That means you can read the code, modify it, and contribute back. View Competition Results Open Source Stockfish is open source (GPLv3 license). □ More compatible: Is slower, but works on older Android devices.A new major release of Stockfish is now available at Stockfish is a 13-time winner of the Top Chess Engine Championship. If you are a user please refer to Stockfish site, or to the FAQ. ⚡️ Faster: Works on most Android devices. This is a discussion group for developers and testers of Stockfish chess engine. It has won more than 20 titles, including World Microcomputer Chess Championship (1996, 2000), World Computer Chess Championship (1999, 2003), World Chess Software Championship (2010), and World Computer Speed Chess Championship (5 times). You may want to use it in your own UCI-compatible chess GUI. Shredder is a commercial chess engine developed in 1993. Note: The Stockfish chess engine is a command line program. ![]() If you're looking for binaries for a specific CPU architecture, see all Windows binaries Android □ More compatible: Is a bit slower, but works on the vast majority of computers. You may want to use it in your own UCI-compatible chess GUI. ![]()
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