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As usual, downloads will be freely available at stockfishchess.org/download.
The engine is now significantly stronger than just a few months ago, and wins four times more game pairs than it loses against the previous release version. Stockfish 14 is now at least 400 Elo ahead of Stockfish 7, a top engine in 2016. During the last five years, Stockfish has thus gained about 80 Elo per year.
Stockfish 14 evaluates positions more accurately than Stockfish 13 as a result of two major steps forward in defining and training the efficiently updatable neural network (NNUE) that provides the evaluation for positions.
First, the collaboration with the Leela Chess Zero team – announced previously – has come to fruition. The LCZero team has provided a collection of billions of positions evaluated by Leela that we have combined with billions of positions evaluated by Stockfish to train the NNUE net that powers Stockfish 14. The fact that we could use and combine these datasets freely was essential for the progress made and demonstrates the power of open source and open data.
Second, the architecture of the NNUE network was significantly updated: the new network is not only larger, but more importantly, it deals better with large material imbalances and can specialize for multiple phases of the game. A new project, kick-started by Gary Linscott and Tomasz Sobczyk, led to a GPU accelerated net trainer written in pytorch. This tool allows for training high-quality nets in a couple of hours.
Finally, this release features some search refinements, minor bug fixes and additional improvements. For example, Stockfish is now about 90 Elo stronger for chess960 (Fischer random chess) at short time control.
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. We invite our chess fans to join the fishtest testing framework and programmers to contribute to the project on github.
PGN:
[Event “CCRL 40/15”]
[Site “https://lichess.org/Q4hJwVvy“]
[Date “2021.07.09”]
[Round “779.1.593”]
[White “Stockfish 14 64-bit”]
[Black “Pedone 3.1 64-bit”]
[Result “1-0”]
[WhiteElo “3503”]
[BlackElo “3333”]
[Variant “Standard”]
[TimeControl “-“]
[ECO “B17”]
[Opening “Caro-Kann Defense: Karpov Variation, Modern Variation”]
[Termination “Normal”]
[Annotator “lichess.org”]
1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Ng5 { B17 Caro-Kann Defense: Karpov Variation, Modern Variation } e6 6. Bd3 Be7 7. N1f3 h6 8. Ne4 Ngf6 9. Nxf6+ Nxf6 10. Qe2 c5 11. Be3 Qc7 12. O-O-O O-O 13. Rhg1 b5 14. dxc5 Bb7 15. Nd4 Bxc5 16. g4 Nd5 17. g5 Nf4 18. Qd2 Nxd3+ 19. Qxd3 h5 20. Nxb5 Bxe3+ 21. Qxe3 Qxh2 22. f4 Bd5 23. Nd6 g6 24. Rd2 Qh4 25. Qe5 Qh3 26. c4 Bc6 27. b3 a5 28. Kb2 Qf3 29. Rgd1 Kh7 30. a3 Kg8 31. Rd4 Kh7 32. R4d3 Qg2+ 33. R1d2 Qg4 34. f5 Rg8 35. fxg6+ Rxg6 36. Nxf7 Rf8 37. Rf2 Qe4 { Black resigns. } 1-0
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