Event: British Chess Championships 2023: Championship
Site: The Venue, De Montfort University, United Kingdom
Date: 2023-07-22
White: Koiza, Peter
WhiteElo: 1963
Black: Merriman, John
BlackElo: 2274
Result: 0-1
ECO: A70
Opening: Benoni Defense: Classical Variation, New York Variation
Variant: Standard
TimeControl: 40 moves in 90 mins + 30 mins + 30 secondss added from move 1

1. d4 { [%eval 0.0] [%clk 1:30:56] } 1... e6 { [%eval 0.2] [%clk 1:30:38] } 2. c4 { [%eval 0.23] [%clk 1:29:57] } 2... Nf6 { [%eval 0.23] [%clk 1:31:01] } 3. Nf3 { [%eval 0.0] [%clk 1:30:08] } 3... c5?! { [%eval 0.62] } { Inaccuracy. d5 was best. } { [%clk 1:31:00] } 4. d5 { [%eval 0.47] [%clk 1:30:07] } 4... exd5 { [%eval 0.7] [%clk 1:31:05] } 5. cxd5 { [%eval 0.92] [%clk 1:30:30] } 5... d6 { [%eval 0.77] [%clk 1:31:28] } 6. Nc3 { [%eval 0.86] [%clk 1:30:06] } 6... g6 { [%eval 0.65] [%clk 1:31:51] } 7. e4 { [%eval 0.7] [%clk 1:30:21] } 7... Bg7 { [%eval 0.75] [%clk 1:30:27] } 8. h3 { [%eval 0.76] [%clk 1:29:28] } 8... O-O { [%eval 0.55] [%clk 1:30:13] } 9. Bd3 { [%eval 0.3] [%clk 1:28:45] } 9... b5 { [%eval 0.44] [%clk 1:14:21] } 10. Nxb5 { [%eval 0.39] [%clk 1:28:13] } 10... Nxe4?! { [%eval 1.06] } { Inaccuracy. Re8 was best. } { [%clk 1:13:18] } 11. Bxe4 { [%eval 1.07] [%clk 1:25:51] } 11... Re8 { [%eval 0.91] [%clk 1:11:17] } 12. Nd2 { [%eval 0.53] [%clk 1:24:31] } 12... Ba6 { [%eval 0.73] [%clk 0:49:28] } 13. a4 { [%eval 0.71] [%clk 1:21:58] } 13... Qa5 { [%eval 0.78] [%clk 0:33:23] } 14. Nxd6 { [%eval 0.69] [%clk 1:19:59] } 14... Rd8?? { [%eval 3.07] } { Blunder. Nd7 was best. } { [%clk 0:33:41] } 15. Nb5?? { [%eval 0.86] } { Blunder. Nxf7 was best. } { [%clk 0:53:36] } 15... Bxb5 { [%eval 0.76] [%clk 0:34:09] } 16. axb5 { [%eval 0.93] [%clk 0:51:04] } 16... Qxa1 { [%eval 0.68] [%clk 0:34:27] } 17. d6 { [%eval 0.78] [%clk 0:48:38] } 17... Nd7?! { [%eval 1.8] } { Inaccuracy. Bxb2 was best. } { [%clk 0:28:32] } 18. Bxa8 { [%eval 1.64] [%clk 0:48:03] } 18... Rxa8 { [%eval 1.54] [%clk 0:28:57] } 19. O-O { [%eval 1.8] [%clk 0:37:39] } 19... Qa5 { [%eval 1.75] [%clk 0:28:13] } 20. Qe2?! { [%eval 1.12] } { Inaccuracy. Re1 was best. } { [%clk 0:31:30] } 20... Rb8 { [%eval 0.97] [%clk 0:25:20] } 21. Re1 { [%eval 1.18] [%clk 0:28:03] } 21... Bf8 { [%eval 1.42] [%clk 0:23:49] } 22. Nc4 { [%eval 1.43] [%clk 0:24:24] } 22... Qxb5 { [%eval 1.55] [%clk 0:23:32] } 23. Bg5 { [%eval 1.1] [%clk 0:23:38] } 23... h6 { [%eval 1.22] [%clk 0:19:36] } 24. Be7?! { [%eval 0.62] } { Inaccuracy. Bd2 was best. } { [%clk 0:21:18] } 24... Bg7 { [%eval 0.73] [%clk 0:19:34] } 25. Qe4?! { [%eval 0.14] } { Inaccuracy. Bh4 was best. } { [%clk 0:15:57] } 25... Bd4 { [%eval 0.26] [%clk 0:12:48] } 26. Qd5 { [%eval 0.04] [%clk 0:13:43] } 26... Qb4 { [%eval 0.0] [%clk 0:11:44] } 27. Re4 { [%eval 0.01] [%clk 0:12:12] } 27... Qb7 { [%eval 0.11] [%clk 0:05:07] } 28. Qxb7 { [%eval 0.12] [%clk 0:10:53] } 28... Rxb7 { [%eval 0.18] [%clk 0:05:35] } 29. Bd8 { [%eval 0.13] [%clk 0:09:09] } 29... Bxb2?? { [%eval 2.31] } { Blunder. Rb4 was best. } { [%clk 0:02:26] } 30. Re7 { [%eval 2.3] [%clk 0:04:21] } 30... Bf6?! { [%eval 3.02] } { Inaccuracy. Bd4 was best. } { [%clk 0:01:01] } 31. Rxd7 { [%eval 3.1] [%clk 0:03:45] } 31... Rxd7 { [%eval 3.17] [%clk 0:00:52] } 32. Bxf6 { [%eval 3.09] [%clk 0:04:08] } 32... Kf8 { [%eval 3.56] [%clk 0:00:31] } 33. Be7+? { [%eval 1.8] } { Mistake. Kf1 was best. } { [%clk 0:02:05] } 33... Ke8 { [%eval 1.88] [%clk 0:00:55] } 34. Na5 { [%eval 2.05] [%clk 0:02:00] } 34... a6 { [%eval 2.25] [%clk 0:00:51] } 35. Kf1 { [%eval 2.31] [%clk 0:02:12] } 35... Ra7 { [%eval 2.14] [%clk 0:00:52] } 36. Ke2 { [%eval 2.29] [%clk 0:01:34] } 36... Kd7? { [%eval 3.85] } { Mistake. Rxe7+ was best. } { [%clk 0:00:55] } 37. Nc4? { [%eval 1.9] } { Mistake. Kd3 was best. } { [%clk 0:00:35] } 37... Rb7 { [%eval 1.94] [%clk 0:00:44] } 38. Kd3 { [%eval 1.93] [%clk 0:00:34] } 38... Rb3+ { [%eval 2.54] [%clk 0:00:38] } 39. Kc2 { [%eval 2.34] [%clk 0:00:56] } 39... Rb5 { [%eval 2.67] [%clk 0:00:53] } 0-1