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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:
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 dxc4 5. Bg2 { E04 Catalan Opening: Open Defense } Bb4+ 6. Bd2 a5 7. Qc2 Bxd2+ 8. Qxd2 c6 9. a4 Ne4 10. Qe3?! { (0.57 → 0.00) Inaccuracy. Qc1 was best. } (10. Qc1 Nd6 11. O-O O-O 12. Ne5 Nd7 13. Nd2 Nb6 14. Rd1 Qc7 15. e4 Rd8 16. b3 cxb3) 10… Nd6 11. O-O O-O 12. Nbd2 b5 13. Rfc1 Nd7 14. Ne5 Nxe5 15. Qxe5 Ra6 16. e3 g5 17. g4 f6 18. Qg3 f5 19. b3 cxb3 20. Nxb3 f4 21. Qh3 Nc4 22. exf4 Rxf4 23. Qh5 Kg7 24. Nc5 Ra7 25. Bxc6? { (-0.47 → -1.64) Mistake. Be4 was best. } (25. Be4 Kh8) 25… Qxd4 26. Ne4 h6 27. Rd1 Qb6 28. axb5 Ne5 29. Qe8 Rf8 30. Qh5 Nxc6 31. bxc6 Raf7 32. Rab1? { (-1.90 → -3.49) Mistake. Ra2 was best. } (32. Ra2 Qxc6) 32… Qxc6 33. Re1 Rf4 34. Nxg5 Qc2 35. Nh3 Rxf2 36. Qe5+?! { (-4.51 → -6.50) Inaccuracy. Ng5 was best. } (36. Ng5) 36… Kg8 37. Qg3 R2f3 38. Qg2 Qc3 39. g5 Rxh3 40. gxh6+ Kh8 41. Qg7+ Qxg7+ 42. hxg7+ Kxg7 43. Re4 Bd7 44. Rb7 Rd3 45. Ra7 Kh6 46. Ra6 { Black wins. } 0-1
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