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HERE IS THE LINK WHERE YOU CAN DOWNLOAD THE NEW STOCKFISH 15:
DOWNLOAD SOME COOL STOCKFISH 15 GAMES IN PGN FORMAT HERE:
http://ccrl.chessdom.com/ccrl/4040/games.html#by_engine
A new major release of Stockfish is now available at https://stockfishchess.org
Stockfish 15 continues to push the boundaries of chess, providing unrivalled analysis and playing strength. In our testing, Stockfish 15 is ahead of Stockfish 14 by 36 Elo points and wins nine times more game pairs than it loses.
Improvements to the engine have made it possible for Stockfish to end up victorious in tournaments at all sorts of time controls ranging from bullet to classical and even at Fischer random chess. At CCC, Stockfish won all of the latest tournaments: CCC 16 Bullet, Blitz and Rapid, CCC 960 championship, and the CCC 17 Rapid. At TCEC, Stockfish won the Season 21, Cup 9, FRC 4 and in the current Season 22 superfinal, at the time of writing, has won 16 game pairs and not yet lost a single one.
This progress is the result of a dedicated team of developers that comes up with new ideas and improvements. For Stockfish 15, we tested nearly 13000 different changes and retained the best 200. These include the fourth generation of our NNUE network architecture, as well as various search improvements. To perform these tests, contributors provide CPU time for testing, and in the last year, they have collectively played roughly a billion chess games. In the last few years, our distributed testing framework, Fishtest, has been operated superbly and has been developed and improved extensively. This work by Pasquale Pigazzini, Tom Vijlbrief, Michel Van den Bergh, and various other developers is an essential part of the success of the Stockfish project.
Indeed, the Stockfish project builds on a thriving community of enthusiasts to offer 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.
The Catalan Opening is a chess opening where White plays d4 and c4 and fianchettoes the white bishop on g2. A common opening sequence is 1.d4 Nf6 2.c4 e6 3.g3, although various other openings can transpose into the Catalan. The Encyclopaedia of Chess Openings lists codes E01–E09 for lines with 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2; other lines are part of E00.
In the Catalan, White adopts a combination of the Queen’s Gambit and Réti Opening. White combines the space-gaining moves d4 and c4 with g3, preparing to fianchetto the king’s bishop. This places pressure mainly on the queenside while hoping to keep the white king safe in the long-term. The c4-pawn can become vulnerable, however, and White might have to sacrifice a pawn.
Black has two main approaches to play against the Catalan: in the Open Catalan Black plays …dxc4 and can either try to hold on to the pawn with …b5 or give it back for extra time to free their game. In the Closed Catalan, Black does not capture on c4; their game can be somewhat cramped for a while, but is quite solid. Additionally, Black has ways to avoid the Catalan.
The Catalan has had proponents at the highest level in chess, with Vladimir Kramnik, Viswanathan Anand and Magnus Carlsen all employing the opening in their respective World Chess Championship title games. A number of other grandmasters have successfully played the Catalan, including Fabiano Caruana, Daniil Dubov, Anish Giri and Ding Liren.
PGN OF THE GAME:
[Event “CCRL 40/15”]
[Site “CCRL”]
[Date “2022.07.06”]
[Round “831.1.714”]
[White “Stockfish 15 64-bit 4CPU”]
[Black “Igel 3.1.0 64-bit 4CPU”]
[Result “1-0”]
[WhiteElo “3533”]
[BlackElo “3409”]
[Variant “Standard”]
[TimeControl “-“]
[ECO “E04”]
[Opening “Catalan Opening: Open Defense”]
[Termination “Unknown”]
[Annotator “lichess.org”]
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 dxc4 5. Bg2 { E04 Catalan Opening: Open Defense } c6 6. Ne5 Bb4+ 7. Bd2 Qxd4 8. Bxb4 Qxe5 9. Na3 b5 10. Bd6 Qxb2 11. O-O Nd5 12. e4 Nc3 13. Qh5 h6 14. e5 Bb7 15. Rfb1 Qe2 16. Bf3 Qd3 17. Nxb5 cxb5 18. Bxb7 Nxb1 19. Qg4 Nd7 20. Bxa8 Nc3 21. Qxg7 Qh7 22. Qg4 Qf5 23. Qxf5 exf5 24. Bb4 Ne4 25. Bc6 a5 26. Bxa5 Ke7 27. f4 Rc8 28. Bxb5 c3 29. Rd1 Ndc5 30. Rc1 Rb8 31. Bf1 Na4 32. a3 Nd2 33. Bb4+ Rxb4 34. axb4 Nb3 35. Rc2 Nd4 36. Bd3 Nxc2 37. Bxc2 Nb6 38. b5 Nd5 39. Kf2 Nb4 40. Bxf5 c2 41. Bxc2 Nxc2 42. b6 Kd7 43. Kf3 Kc6 44. Kg4 Kxb6 { White wins. } 1-0
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