Event: Round 4: Koster, Ramon - Grooten, Herman
Date: 2024-12-24
White: Koster, Ramon
WhiteTitle: FM
WhiteElo: 2330
Black: Grooten, Herman
BlackTitle: IM
BlackElo: 2183
Result: 1-0
ECO: E44
Opening: Nimzo-Indian Defense: St. Petersburg Variation, Romanishin–Psakhis Variation
Variant: Standard

1. d4 { [%eval 0.17] [%clk 1:30:58] } 1... Nf6 { [%eval 0.19] [%clk 1:30:52] } 2. c4 { [%eval 0.18] [%clk 1:31:26] } 2... e6 { [%eval 0.11] [%clk 1:31:18] } 3. Nc3 { [%eval 0.17] [%clk 1:31:54] } 3... Bb4 { [%eval 0.09] [%clk 1:31:42] } 4. e3 { [%eval 0.11] [%clk 1:32:22] } 4... c5 { [%eval 0.25] [%clk 1:31:59] } 5. Ne2 { [%eval 0.28] [%clk 1:32:39] } 5... b6 { [%eval 0.37] [%clk 1:31:39] } 6. a3 { [%eval 0.37] [%clk 1:32:25] } 6... Ba5 { [%eval 0.41] [%clk 1:31:37] } 7. Rb1 { [%eval 0.39] [%clk 1:32:41] } 7... Na6 { [%eval 0.3] [%clk 1:31:42] } 8. g3 { [%eval 0.48] [%clk 1:30:49] } 8... Bb7 { [%eval 0.45] [%clk 1:31:38] } 9. d5 { [%eval 0.32] [%clk 1:30:53] } 9... b5 { [%eval 0.26] [%clk 1:16:32] } 10. b3 { [%eval 0.3] [%clk 1:29:14] } 10... Ne4 { [%eval 0.67] [%clk 1:07:51] } 11. Bd2 { [%eval 0.51] [%clk 1:27:21] } 11... exd5?! { [%eval 1.1] } { Inaccuracy. Bxc3 was best. } { [%clk 1:06:15] } 12. Bg2?! { [%eval 0.28] } { Inaccuracy. Nxe4 was best. } { [%clk 1:26:26] } 12... Bxc3 { [%eval 0.44] [%clk 1:01:15] } 13. Nxc3 { [%eval 0.39] [%clk 1:24:41] } 13... Nc7 { [%eval 0.87] [%clk 0:57:14] } 14. Nxe4 { [%eval 0.46] [%clk 0:49:36] } 14... dxe4 { [%eval 0.45] [%clk 0:56:27] } 15. Ba5 { [%eval 0.5] [%clk 0:49:37] } 15... Qb8 { [%eval 0.63] [%clk 0:53:40] } 16. b4 { [%eval 0.18] [%clk 0:46:17] } 16... Ne6 { [%eval 0.66] [%clk 0:46:31] } 17. O-O { [%eval 0.25] [%clk 0:30:03] } 17... a6 { [%eval 0.3] [%clk 0:43:39] } 18. bxc5 { [%eval 0.38] [%clk 0:26:50] } 18... Nxc5? { [%eval 1.76] } { Mistake. Bc6 was best. } { [%clk 0:40:01] } 19. cxb5 { [%eval 1.22] [%clk 0:23:17] } 19... Qe5 { [%eval 1.18] [%clk 0:37:42] } 20. b6 { [%eval 0.87] [%clk 0:14:59] } 20... O-O? { [%eval 2.33] } { Mistake. Nd3 was best. } { [%clk 0:33:03] } 21. Bb4 { [%eval 2.36] [%clk 0:13:24] } 21... d6 { [%eval 2.18] [%clk 0:28:00] } 22. Qd4 { [%eval 2.13] [%clk 0:10:51] } 22... Qe7 { [%eval 2.24] [%clk 0:22:32] } 23. Rfd1 { [%eval 2.23] [%clk 0:09:03] } 23... Rfd8 { [%eval 2.09] [%clk 0:22:40] } 24. Bxc5 { [%eval 2.19] [%clk 0:05:19] } 24... dxc5 { [%eval 2.15] [%clk 0:23:04] } 25. Qc4 { [%eval 2.16] [%clk 0:05:35] } 25... Qe5 { [%eval 2.7] [%clk 0:14:54] } 26. a4 { [%eval 2.73] [%clk 0:05:21] } 26... a5 { [%eval 2.83] [%clk 0:15:00] } 27. Qb5 { [%eval 2.91] [%clk 0:04:14] } 27... Rd6 { [%eval 3.01] [%clk 0:12:20] } 28. Rxd6 { [%eval 3.4] [%clk 0:03:06] } 28... Qxd6 { [%eval 3.24] [%clk 0:12:45] } 29. Rc1 { [%eval 3.23] [%clk 0:02:05] } 29... Rc8 { [%eval 3.59] [%clk 0:08:09] } 30. Qxa5 { [%eval 3.44] [%clk 0:01:49] } 30... c4 { [%eval 3.54] [%clk 0:08:28] } 31. Bf1 { [%eval 3.26] [%clk 0:01:53] } 31... Ra8 { [%eval 3.37] [%clk 0:05:58] } 32. Qb5 { [%eval 3.65] [%clk 0:01:43] } 32... Ba6 { [%eval 3.56] [%clk 0:04:36] } 33. Qb1 { [%eval 3.53] [%clk 0:01:36] } 33... Qc6 { [%eval 3.63] [%clk 0:04:31] } 34. Qb4 { [%eval 3.59] [%clk 0:01:34] } 34... g6? { [%eval 6.0] } { Mistake. Qd5 was best. } { [%clk 0:04:12] } 35. Bxc4 { [%eval 5.91] [%clk 0:01:27] } 35... Kg7 { [%eval 7.09] [%clk 0:03:44] } 36. Qb2+ { [%eval 6.67] [%clk 0:01:56] } 36... Qf6 { [%eval 7.27] [%clk 0:03:33] } 37. Qxf6+ { [%eval 7.44] [%clk 0:02:13] } 37... Kxf6 { [%eval 7.28] [%clk 0:03:59] } 38. Bxa6 { [%eval 7.23] [%clk 0:02:29] } 38... Rxa6 { [%eval 7.11] [%clk 0:04:25] } 39. b7 { [%eval 6.96] [%clk 0:01:42] } 1-0