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 “2023.07.19”]
[Round “887.4.671”]
[White “Superultra 1.0 64-bit”]
[Black “Stockfish 16 64-bit”]
[Result “*”]
[WhiteElo “3360”]
[BlackElo “3516”]
[Variant “Standard”]
[TimeControl “-“]
[ECO “C65”]
[Opening “Ruy Lopez: Berlin Defense”]
[Termination “Unterminated”]
[Annotator “lichess.org”]
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 { C65 Ruy Lopez: Berlin Defense } 4. d3 Bc5 5. c3 O-O 6. O-O Re8 7. Nbd2 a6 8. Bxc6 dxc6 9. Nc4 Nd7 10. Re1 Bf8 11. d4 exd4 12. cxd4 b5 13. Na5 Qf6 14. e5 Qg6 15. Nh4 Qe6 16. a3 Qd5 17. b4 Nb6 18. Nf3 Bg4 19. Be3 Nc4 20. Nxc4 bxc4 21. Bd2 Rab8 22. Bc3 a5 23. bxa5 Rb3 24. Re3 c5 25. h3 Bh5 26. Qd2 Rxc3 27. Rxc3 Bxf3 28. Rxf3 cxd4 29. a6 Ra8 30. Re1 c5 31. Qa5 Qd7 32. e6 fxe6 33. a4 c3 34. Qb5 Qxb5 35. axb5 c4 36. Rf4 Bc5 37. Rfe4 Rd8 38. g3 Bb6 39. Kf1 c2 40. Rc1 c3 41. Re2 d3 42. Rexc2 dxc2 43. Rxc2 Rc8 44. Ke2 Rc5 45. f4 Kf7 46. Kd3 Rxb5 47. Rxc3 Ra5 48. Rc6 Rxa6 49. Kc4 Ra4+ *
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