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 "2023.07.07"]
[Round "885.4.253"]
[White "Superultra 1.0 64-bit"]
[Black "Stockfish 16 64-bit"]
[Result "0-1"]
[WhiteElo "3362"]
[BlackElo "3515"]
[Variant "Standard"]
[TimeControl "-"]
[ECO "C77"]
[Opening "Ruy Lopez: Morphy Defense, Wormald Attack"]
[Termination "Unknown"]
[Annotator "lichess.org"]
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. Qe2 a6 5. Ba4 { C77 Ruy Lopez: Morphy Defense, Wormald Attack } Be7 6. c3 d6 7. O-O Bd7 8. d4 O-O 9. d5 Nb8 10. Bxd7 Nbxd7 11. c4 c6 12. dxc6 bxc6 13. Nc3 a5 14. b3 Nc5 15. Rd1 Qc7 16. Rb1 Rab8 17. Ba3 Nfd7 18. Qd2 h6 19. Rb2 Rfe8 20. g3 Nf8 21. Bxc5 dxc5 22. Kf1 Rbd8 23. Qe1 Bd6 24. Rd3 Ne6 25. Kg2 Nd4 26. Rbd2 g6 27. h4 h5 28. Qe3 f6 29. Qh6 Qf7 30. Rd1 Bf8 31. Qc1 Qe6 32. Na4 f5 33. Ng5 Qe7 34. Qe3 Bh6 35. exf5 gxf5 36. R3d2 Qf8 37. Rh1 Qd6 38. Re1 Rd7 39. Qc3 Bxg5 40. hxg5 h4 41. Rh1 f4 42. Rxh4 f3+ 43. Kh3 Qf8 44. Qd3 e4 45. Qe3 Nf5 46. Rxd7 Nxe3 47. Rf4 Nf5
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