This is a very strategic chess game between Obsidian (3645) and Integral (3576) from the Premier Division of the Top Chess Engine Championship Season 28, round 39. The opening is a French Defense, Tarrasch, with play beginning from the position after 7…c4. With the structure defined early, each side generally presses where they have space. Once opposite-side castling appears, however, both sides play on both wings. Obsidian is a chess engine written in C++, first developed in April 2023. It evaluates positions with a neural network trained on Lc0 data.
#Obsidian #Integral #TCEC
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https://github.com/gab8192/Obsidian
PGN
1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. f4 c5 6. c3 Nc6 7. Ndf3 c4 8. h4 b5 9. h5 b4 10. g4 f6 11. Bg2 Qb6 12. Nh3 Bb7 13. Nf2 O-O-O 14. O-O Re8 15. Bd2 Kb8 16. Rb1 Be7 17. b3 fxe5 18. fxe5 cxb3 19. Qxb3 Ba6 20. Rfe1 Bc4 21. Qb2 a5 22. a3 b3 23. a4 g6 24. Be3 gxh5 25. Nd2 Ba6 26. Qc1 Ka8 27. Rxb3 Qa7 28. g5 Rb8 29. Nh3 Rxb3 30. Nxb3 Rb8 31. Qd1 h4 32. Nf4 Nf8 33. Nd2 Rb2 34. Qf3 Bb7 35. Qg4 Nd8 36. Rc1 Ra2 37. Bf1 Qb8 38. Bd3 Nf7 39. Nf3 Qd8 40. Ne2 Nh8 41. Qxh4 Qe8 42. Nf4 Nhg6 43. Nxg6 hxg6 44. Qh6 Ka7 45. Qg7 Rxa4 46. Rf1 Qd8 47. Bxg6 Ba6 48. Re1 Rc4 49. Bh5 Rc7 50. Qh6 Bd3 51. Ra1 Rc8 52. Qg7 Rc7 53. Rxa5+ Kb8 54. Ra2 Qc8 55. Qh6 Be4 56. Rb2+ Ka7 57. Nd2 Qa6 58. Kf2 Qa3 59. Rb3 Qa4 60. c4 Rc8 61. Qg7 Rc7 62. Qf7 Bc2 63. Rb2 Bd6 64. Qe8 Bb4 65. Qxa4+ Bxa4 66. Rxb4 Bc6 67. g6 Bb7 68. Bh6 Nd7 69. g7 Rc8 70. Rxb7+ Kxb7 71. cxd5 exd5 72. Bf7 Kb6 73. Bg5 Kc7 74. e6 Nf8 75. e7 Nh7 76. Bh4 Kd7 77. e8=Q+ Rxe8 78. Bxe8+ Kxe8 79. g8=Q+ Kd7 80. Qxd5+ Ke8 81. Qb7 Ng5 82. Bxg5 Kf8 83. Qh7 Ke8 84. Qe7
