17 Moves of Pure Art in the SCOTCH GAMBIT! - Stockfish 14 vs Igel - Scotch Gambit - London Defense
247As usual, downloads will be freely available at stockfishchess.org/download.
The engine is now significantly stronger than just a few months ago, and wins four times more game pairs than it loses against the previous release version. Stockfish 14 is now at least 400 Elo ahead of Stockfish 7, a top engine in 2016. During the last five years, Stockfish has thus gained about 80 Elo per year.
Stockfish 14 evaluates positions more accurately than Stockfish 13 as a result of two major steps forward in defining and training the efficiently updatable neural network (NNUE) that provides the evaluation for positions.
First, the collaboration with the Leela Chess Zero team - announced previously - has come to fruition. The LCZero team has provided a collection of billions of positions evaluated by Leela that we have combined with billions of positions evaluated by Stockfish to train the NNUE net that powers Stockfish 14. The fact that we could use and combine these datasets freely was essential for the progress made and demonstrates the power of open source and open data.
Second, the architecture of the NNUE network was significantly updated: the new network is not only larger, but more importantly, it deals better with large material imbalances and can specialize for multiple phases of the game. A new project, kick-started by Gary Linscott and Tomasz Sobczyk, led to a GPU accelerated net trainer written in pytorch. This tool allows for training high-quality nets in a couple of hours.
Finally, this release features some search refinements, minor bug fixes and additional improvements. For example, Stockfish is now about 90 Elo stronger for chess960 (Fischer random chess) at short time control.
The Stockfish project builds on a thriving community of enthusiasts (thanks everybody!) that contribute their expertise, time, and resources to build a free and open-source chess engine that is robust, widely available, and very strong. We invite our chess fans to join the fishtest testing framework and programmers to contribute to the project on github.
PGN:
[Event "?"]
[Site "https://lichess.org/q6FuxrrY"]
[Date "2021.07.05"]
[Round "57"]
[White "Stockfish_14"]
[Black "Igel_3.0.0"]
[Result "1-0"]
[WhiteElo "?"]
[BlackElo "?"]
[Variant "Standard"]
[TimeControl "-"]
[ECO "C44"]
[Opening "Scotch Game: Scotch Gambit, London Defense"]
[Termination "Unknown"]
[Annotator "lichess.org"]
1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bb4+ { C44 Scotch Game: Scotch Gambit, London Defense } 5. c3 dxc3 6. O-O cxb2 7. Bxb2 Nf6 8. Ng5 O-O 9. e5 d5 10. exf6 dxc4 11. Qh5 h6 12. a3 Bd6 13. Ne4 Re8 14. fxg7 Re6 15. f4 f5 16. Qxf5 Qe7 17. Ng5 hxg5 18. Qh3 Qxg7 19. Bxg7 Kxg7 20. Qc3+ Kg8 21. fxg5 Bd7 22. Nd2 Re7 23. Rf6 Re6 24. Raf1 Be5 25. Qf3 Rxf6 26. gxf6 Rf8 27. Qd5+ Rf7 28. Ne4 Bd6 29. Qg5+ Kh8 30. Nxd6 cxd6 31. Rf4 Bf5 { White wins. } 1-0