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 “CCC20 Bullet: Finals (1|1)”]
[Site “?”]
[Date “2023.07.20”]
[Round “1”]
[White “Stockfish”]
[Black “Torch”]
[Result “*”]
[WhiteElo “?”]
[BlackElo “?”]
[Variant “Standard”]
[TimeControl “60+1”]
[ECO “C60”]
[Opening “Ruy Lopez: Fianchetto Defense”]
[Termination “Unterminated”]
[Annotator “lichess.org”]
1. e4 e5 2. Nf3 Nc6 3. Bb5 g6 { C60 Ruy Lopez: Fianchetto Defense } 4. c3 d6 5. d4 Bd7 6. Qb3 Na5 7. Qa4 c6 8. Be2 b5 9. Qc2 exd4 10. cxd4 Nf6 11. O-O Bg7 12. Bf4 Nb7 13. a4 O-O 14. Bg5 Qc8 15. Bxf6 Bxf6 16. axb5 cxb5 17. Qd2 Bc6 18. Rc1 Qe8 19. Rxc6 Qxc6 20. Nc3 Bg7 21. Bxb5 Qc8 22. h4 a6 23. Be2 Qg4 24. b4 Kh8 25. g3 Qe6 26. Bd3 a5 27. b5 a4 28. Nd5 Nc5 29. dxc5 Bxa1 30. Qa2 Bg7 31. c6 a3 32. Kg2 Qg4 33. c7 Qc8 34. h5 Qb7 35. Bc4 Bb2 36. b6 g5 37. Qb3 g4 38. Nh4 Be5 39. Qb1 Rac8 40. Qd3 Qc6 41. Nf5 Ra8 42. Ba2 Rae8 43. h6 Qc1 44. Qe2 Qb2 45. Qxb2 axb2 46. Nfe7 Rb8 47. Nc6 Rbc8 48. Nde7 Rxc7 49. bxc7 b1=Q 50. Bxb1 Bg7 51. Nd8 Bxh6 52. c8=Q f5 53. exf5 Bg5 54. f6 Bxf6 55. Qf5 Rf7 56. Nxf7+ Kg7 57. Qxh7+ Kf8 58. Nxd6 Ba1 *
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