![]() That contribute their expertise, time, and resources to build a freeĪnd open source chess engine that is robust, widely available, and The network is optimized and trained on the The NNUE evaluation computes this value with a neural network based The classicalĮvaluation computes this value as a function of various chessĬoncepts, handcrafted by experts, tested and tuned using fishtest. Recommended parameters of the NNUE network are embedded inĭistributed binaries, and Stockfish will use NNUE by default.īoth the NNUE and the classical evaluations are available, andĬan be used to assign values to positions that are later used inĪlpha-beta (PVS) search to find the best move. NNUE networks can be very efficiently evaluated on CPUs. Stockfish remains a CPU-only engine, since the NNUE evaluation was first introduced in shogi, and ported to Updatable neural network (NNUE) for the evaluation in Stockfish,Īnd associated tuning of the engine as a whole. This jump in strength, visible in regular progression tests duringĭevelopment, results from the introduction of an efficiently Stockfish 12 will typically win at least ten times more game pairs This version 12 of Stockfish plays significantly stronger thanĪny of its predecessors. It is our pleasure to release Stockfish 12 to users worldwide. Obviously, we condemn the approach taken.Ĭurrent maintainer of the Stockfish project Only after explicitly informing Albert Silver (the author of the net in Fat Fritz 2) of a license violation have matching C++ sources, but not the net weights, been made available. In particular, the license states that if one redistributes a program derived from our work, the corresponding modifications of our sources and all information needed to build that program must be made available. Selling Stockfish derivatives is possible with the GPLv3 license we grant, but not without requirements. Claims to the contrary appear misleading. Indeed, we feel that customers buying Fat Fritz 2 get very little added value for money. Furthermore, the engine Fat Fritz 2 fails to convince on independent rating lists, casting doubt on the usefulness of those modifications. ChessBase’s communication on Fat Fritz 2, claiming originality where there is none, has shocked our community. This chess engine is a Stockfish derivative, with a few lines of code modification (engine name, authors list and a few parameters), and a new set of NNUE net weights considered proprietary. Recently, ChessBase has started distribution and sales of the Fat Fritz 2 chess engine. Be assured that free engines will serve you well! We proudly provide the tools for free chess analysis to millions of users, with countless titled players using Stockfish for their preparation. ![]() The recent progress in playing strength of Stockfish confirms the path taken. We do this because we are convinced that open software and open data are key ingredients to make rapid progress, and thus for the benefit of our users. Stockfish is an open-source project, sharing and freely distributing the code, tools and data needed to deliver this chess engine. Open-source chess engines serve the chess community very well. Going forward, the Leela Chess Zero and Stockfish teams will joinįorces to demonstrate our commitment to open source chess engines and This version has won the superfinals of the TCEC Season 19 and Network retrained on billions of positions, much faster networkĮvaluation code, and significantly improved search heuristics, as When playing against a one-year-old Stockfish, it wins 60 Stockfish 13 outperforms Stockfish 12 by at leastģ5 Elo. This version of Stockfish is significantly stronger than any of its We refer to our statement on Fat Fritz 2Īnd a community blog for further information. Which is a copy of a very recent development version of Stockfish Triggered by the start of sales of the Fat Fritz 2 engine by ChessBase, High-quality releases of Stockfish! Sadly, this decision has been The good news first: from now on, our users can expect more frequent Who contribute their expertise, time, and resources to build a freeĪnd open-source chess engine that is robust, widely available, and ![]() The Stockfish project builds on a thriving community of enthusiasts It is our pleasure to release Stockfish 13 to chess fans worldwide.Īs usual, downloads are freely available at
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