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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/5ajukx8y“]
[Date “2021.07.22”]
[White “?”]
[Black “?”]
[Result “1-0”]
[UTCDate “2021.07.22”]
[UTCTime “11:08:35”]
[WhiteElo “?”]
[BlackElo “?”]
[Variant “Standard”]
[TimeControl “-“]
[ECO “B90”]
[Opening “Sicilian Defense: Najdorf Variation, Adams Attack”]
[Termination “Normal”]
[Annotator “lichess.org”]
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3 { B90 Sicilian Defense: Najdorf Variation, Adams Attack } g6?! { (0.10 → 0.63) Inaccuracy. e5 was best. } (6… e5 7. Nb3 Be6 8. Be3 Nbd7 9. g4 h6 10. Qd2 b5 11. Bg2) 7. Be3 Nc6 8. Qd2 Bg7 9. O-O-O O-O 10. g4 Bd7 11. Be2 Rb8 12. g5 Ne8 13. h4 b5 14. Nd5 e6 15. Nb4 Nxd4 16. Bxd4 Bxd4 17. Qxd4 a5 18. Nd3 Qb6 19. Qxb6 Rxb6 20. e5 b4 21. exd6 Bb5 22. d7 Nd6 23. Rhe1 Bxd7 24. Ne5 Be8 25. Rd4 Nf5 26. Rc4 Bb5 27. Rc7 Rbb8 28. Bxb5 Rxb5 29. a4 bxa3 30. bxa3 h5 31. gxh6 Nxh6 32. c4 Rbb8 33. Kc2 Rbc8 34. Rxc8 Rxc8 35. Kc3 Kg7 36. Rb1 Kf6 37. Rb5 a4 38. Ra5 Rh8 39. f4 Nf5 40. Ra7 Ne7 41. Ng4+ Kf5 42. Rxe7 Kxg4 43. Rxf7 Rb8 44. c5 Rb3+ 45. Kc4 Rxa3 46. c6 Ra1 47. Kb4 a3?! { (0.92 → 1.79) Inaccuracy. Kxh4 was best. } (47… Kxh4 48. c7 Rc1 49. Kxa4 g5 50. Kb5 g4 51. Kb6 g3 52. Rg7 Kh3 53. Kb7 Kg2 54. c8=Q) 48. c7 a2 49. Kb3 Rc1 50. Kxa2 Kxh4 51. Kb2 Rc6 52. Kb3 g5 53. Kb4 g4 54. Kb5 Rc3 55. Kb6 g3?! { (1.85 → 2.68) Inaccuracy. Kg3 was best. } (55… Kg3 56. Kb7) 56. Kb7 Rb3+ 57. Kc6 Rc3+ 58. Kd7 g2 59. c8=Q Rd3+ 60. Kxe6 Kh3 61. Rg7 Re3+ 62. Kf6+ Kh2 63. Qg4 g1=Q 64. Qxg1+ { Black resigns. } 1-0
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