- Stockfish development version software#
- Stockfish development version license#
- Stockfish development version free#
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. We invite our chess fans to join the fishtest testing framework and programmers to contribute to the project.Ī new major release of Stockfish is now available at
Stockfish development version free#
The Stockfish project builds on a thriving community of enthusiasts (thanks everybody!) that contribute their expertise, time, and resources to build a free and open-source chess engine that is robust, widely available, and very strong.
Stockfish development version software#
and ), and we are proud that it has been hailed as a ‘ historic violation settlement’ by the Software Freedom Conservancy. This settlement has been covered by major chess sites (see e.g.
Stockfish development version license#
This has been an intense process that included filing a lawsuit, a court hearing, and finally negotiating a settlement that established that ChessBase infringed on the license by not distributing the Stockfish derivatives Fat Fritz 2 and Houdini 6 as free software, and that ensures ChessBase will respect the Free Software principles in the future. In this release period, the Stockfish team has successfully enforced its GPL license against ChessBase. This convention scales down evaluations a bit compared to Stockfish 15 and allows for consistent evaluations in the future. With a +1 evaluation, Stockfish has now a 50% chance of winning the game against an equally strong opponent. An evaluation of +1 is now no longer tied to the value of one pawn, but to the likelihood of winning the game.
This release also introduces a new convention for the evaluation that is reported by search. Stockfish continues to win in a dominating way all chess engine tournaments, including the TCEC Superfinal, Cup, FRC, DFRC, and Swiss as well as the CCC Bullet, Blitz, and Rapid events. More importantly, also for standard chess this release progressed and will win two times more game pairs than it loses against Stockfish 15. As a result, Elo gains are largest for FRC, reaching up to 50 Elo for doubly randomized FRC (DFRC). With this release, version 5 of the NNUE neural net architecture has been introduced, and the training data has been extended to include Fischer random chess (FRC) positions. Today, we have the pleasure to announce Stockfish 15.1.Īs usual, downloads will be freely available at /download Elo gain and competition results
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