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 “2023.07.20”]
[Round “887.4.707”]
[White “Seer 2.6.0 64-bit”]
[Black “Stockfish 16 64-bit”]
[Result “*”]
[WhiteElo “3403”]
[BlackElo “3516”]
[Variant “Standard”]
[TimeControl “-“]
[ECO “B50”]
[Opening “Sicilian Defense: Delayed Alapin”]
[Termination “Unterminated”]
[Annotator “lichess.org”]
1. e4 c5 2. Nf3 d6 3. c3 { B50 Sicilian Defense: Delayed Alapin } Nf6 4. Qc2 Qc7 5. Bc4 Bg4 6. d4 e6 7. Nbd2 Be7 8. Qa4+ Nfd7 9. d5 O-O 10. dxe6 Bxe6 11. Bxe6 fxe6 12. Qb3 Rf6 13. O-O Nc6 14. Nc4 Raf8 15. a4 b6 16. Qd1 h6 17. h3 R6f7 18. Re1 a6 19. Ne3 Kh8 20. Ng4 c4 21. Be3 Qb7 22. Rf1 Rxf3 23. gxf3 Nce5 24. Nxe5 Nxe5 25. f4 Nd3 26. Qf3 Bg5 27. f5 Bd8 28. Qg2 exf5 29. exf5 Qd7 30. f4 Rxf5 31. Kh1 Bf6 32. Bxb6 Nxf4 33. Qa8+ Kh7 34. Qe4 d5 35. Qc2 Be5 36. Rf3 g6 37. Raf1 Rh5 38. Qh2 Kg8 39. Bd4 Bd6 40. Qf2 g5 41. Rg3 Rxh3+ 42. Rxh3 Qxh3+ 43. Kg1 Qg4+ 44. Kh1 Qh3+ 45. Kg1 Qg4+ 46. Kh1 Qh5+ 47. Qh2 Nh3 48. Qg2 g4 49. Rf6 Bf4 50. Rg6+ Qxg6 51. Qxd5+ Qf7 52. Qa8+ Bb8 53. Qxb8+ *
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