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Top Chess Engine Championship, formerly known as Thoresen Chess Engines Competition (TCEC or nTCEC), is a computer chess tournament that has been run since 2010. It was organized, directed, and hosted by Martin Thoresen until the end of Season 6; from Season 7 onward it has been organized by Chessdom. It is often regarded as the Unofficial World Computer Chess Championship because of its strong participant line-up and long time-control matches on high-end hardware, giving rise to very high-class chess.
The TCEC competition is divided into seasons, where each season happens over a course of a few months, with matches played round-the-clock and broadcast live over the internet. Each season is divided into several qualifying stages and one “superfinal”, where the top two chess engines play 100 games to win the title of “TCEC Grand Champion”. In the superfinal, each engine plays 50 openings, once as each side. Beginning in Season 11 in 2018, a division system was introduced; the top 2 engines in each division are promoted, and the bottom 2 are relegated. Currently, there are 5 divisions (a Premier division, and divisions 1-4); newcomers generally start in division 4.
PGN:
[Event “Import”]
[Site “https://lichess.org/CuX34HMO“]
[Date “2021.07.29”]
[White “?”]
[Black “?”]
[Result “1-0”]
[UTCDate “2021.07.29”]
[UTCTime “10:02:39”]
[WhiteElo “?”]
[BlackElo “?”]
[Variant “Standard”]
[TimeControl “-“]
[ECO “D15”]
[Opening “Slav Defense: Chameleon Variation, Advance System”]
[Termination “Normal”]
[Annotator “lichess.org”]
1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 a6 5. c5 { D15 Slav Defense: Chameleon Variation, Advance System } Bg4?! { (0.24 → 0.79) Inaccuracy. Bf5 was best. } (5… Bf5 6. Qb3 Ra7 7. Bf4 Nbd7 8. h3 e6 9. e3 Be7 10. Rc1) 6. Ne5 Be6 7. Qb3 Ra7 8. e3 g6 9. Bd2 Bg7 10. f3 Nfd7 11. Nxd7 Bxd7 12. O-O-O O-O 13. Na4 e5 14. dxe5 Bxe5 15. g4 Bg7 16. h3 a5 17. Bc3 Bxc3 18. Qxc3 Qe7 19. h4 Be6 20. h5 Nd7 21. h6 f6 22. e4 Raa8 23. exd5?! { (1.39 → 0.79) Inaccuracy. Bd3 was best. } (23. Bd3 Qf7 24. exd5 Bxd5 25. Bc2 Rae8 26. Nb6 Nxb6 27. cxb6 Re7 28. Rhe1 Rfe8 29. Rxe7 Qxe7) 23… cxd5 24. Kb1 Ne5 25. Bb5 Rad8 26. Rhf1 g5 27. Nb6 Nc6 28. Bxc6 bxc6 29. Ka1 Rfe8 30. Rh1 Qf7 31. a3 Qg6 32. Rd2 Bf7 33. Rd4 Re2 34. Nc4 Rb8 35. Rd2 Rxd2 36. Nxd2 a4 37. Nf1 Be6 38. Qd4 Re8 39. Ng3 Kf7 40. Qd1 f5 41. Rg1 f4 42. Ne2 Qxh6 43. Rh1 Qg7 44. Qxa4 Bd7 45. Nd4 h5 46. gxh5 Qf6 47. h6 Kg8 48. h7+ Kh8 49. Qb4 Rf8 50. Qd2 Rf7 51. Ka2 Rxh7 52. Rd1 Re7?! { (1.63 → 2.23) Inaccuracy. g4 was best. } (52… g4) 53. Qb4 Qf8 54. Qb7 Qc8 55. Qxc8+ Bxc8 56. b4 Rc7 57. a4 Kg7 58. Rc1 Kf6 59. b5 Bb7?! { (2.19 → 3.10) Inaccuracy. cxb5 was best. } (59… cxb5 60. axb5) 60. Kb3 g4 61. fxg4 Ke5 62. Nf3+ Ke4 63. Ng5+ Ke5 64. Kb4 Kf6 65. Nf3 Re7 66. Ka5 Bc8 67. g5+ Kg7 68. Re1 Re3 69. Rxe3 fxe3 70. Nd4 Bg4 71. b6 Bc8 72. Kb4 Kg6 73. Kc3 e2 74. Kd2 Bb7 75. Nxc6 d4 76. Nxd4 Kg7 77. c6 Ba6 78. b7 e1=Q+?! { (77.70 → Mate in 9) Checkmate is now unavoidable. Kg6 was best. } (78… Kg6 79. Nf3) 79. Kxe1 Kg6 80. Nf3 Bc4 81. c7 Kh5 82. c8=Q Be6 83. Ne5 Bxc8 84. bxc8=Q { Black resigns. } 1-0