Stockfish continues to demonstrate its ability to discover superior moves with remarkable speed. In self-play against Stockfish 15, this new release gains up to 50 Elo and wins up to 12 times more game pairs than it loses. In major chess engine tournaments, Stockfish reliably tops the rankings winning the TCEC season 24 Superfinal, Swiss, Fischer Random, and Double Random Chess tournaments and the CCC 19 Bullet, 20 Blitz, and 20 Rapid competitions. Leela Chess Zero was the challenger in most finals, putting top-engine chess now firmly in the hands of teams embracing free and open-source software.This updated version of Stockfish introduces several enhancements, including an upgraded neural net architecture (SFNNv6), improved implementation, and refined parameterization. The ongoing utilization of Leela’s data combined with a novel inference approach exploiting sparsity, and network compression ensure a speedy evaluation and modest binary sizes while allowing for more weights and higher accuracy. The search has undergone more optimization, leading to improved performance, particularly in longer analyses. Additionally, the Fishtest framework has been improved and is now able to run the tests needed to validate new ideas with 10000s of CPU cores.Stockfish now comes with documentation, found in the wiki folder when downloading it or on GitHub. Additionally, Stockfish now includes a clear and consistent forced tablebase win score, displaying a value of 200 minus the number of plies required to reach a tablebase win. Furthermore, the UCI_Elo option, to reduce its strength, has been calibrated. It is worth noting that the evaluation system remains consistent with Stockfish 15.1, maintaining the choice that 100cp means a 50% chance of winning the game against an equal opponent. Finally, binaries of our latest development version are now provided continuously as pre-releases on GitHub making it easier for enthusiasts to download the latest and strongest version of the program, we thank Roman Korba for having provided a similar service for a long time.
[Event "CCRL 40/15"]
[Site "CCRL"]
[Date "2023.08.04"]
[Round "889.2.968"]
[White "Stockfish 16 64-bit"]
[Black "Caissa 1.11 64-bit"]
[Result "*"]
[WhiteElo "3516"]
[BlackElo "3422"]
[Variant "Standard"]
[TimeControl "-"]
[ECO "D16"]
[Opening "Slav Defense: Soultanbeieff Variation"]
[Termination "Unterminated"]
[Annotator "lichess.org"]
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 e6 { D16 Slav Defense: Soultanbeieff Variation } 6. e4 Bb4 7. Bxc4 Nxe4 8. O-O Nf6 9. Re1 O-O 10. Bg5 Nbd7 11. Qc2 h6 12. Bh4 Be7 13. a5 Re8 14. Bg3 a6 15. h3 Bb4 16. Bh4 Bxa5 17. Ne5 Bb4 18. Re3 Qc7 19. Nxf7 Kxf7 20. Rxe6 Rxe6 21. Bxe6+ Kf8 22. Ba2 Qd8 23. Re1 Be7 24. Re3 Qe8 25. d5 cxd5 26. Nxd5 Nxd5 27. Qh7 N7b6 28. Bf6 Qf7 *
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