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.
PGN OF THE GAME:
[Event “CCRL 40/15”]
[Site “CCRL”]
[Date “2023.07.06”]
[Round “885.4.230”]
[White “Stockfish 16 64-bit”]
[Black “Halogen 11 64-bit”]
[Result “*”]
[WhiteElo “3516”]
[BlackElo “3311”]
[Variant “Standard”]
[TimeControl “-“]
[ECO “D02”]
[Opening “Queen’s Pawn Game: Symmetrical Variation”]
[Termination “Unterminated”]
[Annotator “lichess.org”]
1. d4 d5 2. Nf3 Nf6 { D02 Queen’s Pawn Game: Symmetrical Variation } 3. c4 c6 4. g3 dxc4 5. Bg2 e6 6. O-O b5 7. a4 Bb7 8. Ne5 a6 9. b3 cxb3 10. Bb2 Nbd7 11. Nd2 Nxe5 12. dxe5 Nd5 13. Qxb3 Be7 14. Ne4 O-O 15. Bd4 Nf4 16. Bc5 Nxg2 17. Rfd1 Qe8 18. Kxg2 a5 19. f3 Ba6 20. Qe3 h6 21. Bd6 Bxd6 22. Rxd6 Qe7 23. Rad1 bxa4 24. Nf6+ Kh8 25. Qe4 gxf6 26. Qh4 Kh7 27. exf6 Qe8 28. Qe4+ Kh8 29. Qh4 Kh7 30. Qe4+ Kh8 31. Rd7 Bxe2 32. Qe3 Bxf3+ 33. Kxf3 Kh7 34. Qe4+ Kh8 35. Qh4 Kh7 36. Qe4+ Kh8 *
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