Event: Round 4: Koellner, Ruben Gideon - Petrov, Nikita
Date: 2025-05-29
White: Koellner, Ruben Gideon
WhiteTitle: IM
WhiteElo: 2339
Black: Petrov, Nikita
BlackTitle: GM
BlackElo: 2546
Result: 0-1
ECO: D04
Opening: Queen's Pawn Game: Colle System
Variant: Standard
TimeControl: 3+2

1. d4 { [%eval 0.17] [%clk 0:03:02] } 1... Nf6 { [%eval 0.19] [%clk 0:03:03] } 2. Nf3 { [%eval 0.11] [%clk 0:03:03] } 2... d5 { [%eval 0.11] [%clk 0:03:04] } 3. e3 { [%eval 0.0] [%clk 0:03:04] } 3... a6 { [%eval 0.13] [%clk 0:03:05] } 4. Nbd2 { [%eval 0.07] [%clk 0:03:04] } 4... Bf5 { [%eval 0.07] [%clk 0:03:02] } 5. Ne5 { [%eval -0.06] [%clk 0:03:05] } 5... h6 { [%eval 0.13] [%clk 0:02:56] } 6. Bd3 { [%eval 0.08] [%clk 0:02:59] } 6... e6 { [%eval 0.14] [%clk 0:02:51] } 7. Bxf5 { [%eval 0.13] [%clk 0:02:58] } 7... exf5 { [%eval 0.24] [%clk 0:02:51] } 8. c4 { [%eval 0.26] [%clk 0:02:59] } 8... c6 { [%eval 0.17] [%clk 0:02:46] } 9. O-O { [%eval 0.2] [%clk 0:02:55] } 9... Nbd7 { [%eval 0.26] [%clk 0:02:45] } 10. cxd5 { [%eval 0.13] [%clk 0:02:47] } 10... Nxd5 { [%eval 0.21] [%clk 0:02:45] } 11. Ndc4 { [%eval -0.13] [%clk 0:02:38] } 11... Nxe5 { [%eval -0.05] [%clk 0:02:39] } 12. Nxe5 { [%eval -0.08] [%clk 0:02:28] } 12... Bd6 { [%eval -0.07] [%clk 0:02:39] } 13. Nc4 { [%eval -0.35] [%clk 0:02:21] } 13... Bc7 { [%eval -0.36] [%clk 0:02:40] } 14. Qf3 { [%eval -0.72] [%clk 0:02:09] } 14... Qf6 { [%eval -0.8] [%clk 0:02:27] } 15. b3 { [%eval -0.87] [%clk 0:01:36] } 15... O-O { [%eval -0.78] [%clk 0:02:26] } 16. Ba3 { [%eval -0.93] [%clk 0:01:37] } 16... Rfe8 { [%eval -1.01] [%clk 0:02:26] } 17. Rfe1 { [%eval -1.41] [%clk 0:01:33] } 17... Re6 { [%eval -1.05] [%clk 0:02:24] } 18. Nb2 { [%eval -1.3] [%clk 0:01:20] } 18... Rae8 { [%eval -1.15] [%clk 0:02:12] } 19. Nd3 { [%eval -1.15] [%clk 0:01:14] } 19... b6?! { [%eval -0.28] } { Inaccuracy. g5 was best. } { [%clk 0:01:55] } 20. Rac1 { [%eval -0.3] [%clk 0:01:13] } 20... Re4 { [%eval -0.26] [%clk 0:01:54] } 21. g3 { [%eval -0.41] [%clk 0:01:07] } 21... Qe6 { [%eval -0.24] [%clk 0:01:46] } 22. Rc2 { [%eval -0.44] [%clk 0:00:57] } 22... f4 { [%eval -0.4] [%clk 0:01:36] } 23. gxf4?? { [%eval -3.37] } { Blunder. Ne5 was best. } { [%clk 0:00:49] } 23... Bxf4 { [%eval -2.91] [%clk 0:01:24] } 24. Rec1? { [%eval -4.87] } { Mistake. Ne5 was best. } { [%clk 0:00:32] } 24... Bxe3 { [%eval -4.86] [%clk 0:01:13] } 25. fxe3 { [%eval -4.91] [%clk 0:00:21] } 25... Rxe3 { [%eval -4.75] [%clk 0:01:14] } 26. Qg2?! { [%eval -6.19] } { Inaccuracy. Qf1 was best. } { [%clk 0:00:18] } 26... Rxd3 { [%eval -6.09] [%clk 0:01:12] } 27. Rxc6 { [%eval -7.33] [%clk 0:00:18] } 27... Qf5?! { [%eval -5.33] } { Inaccuracy. Qe3+ was best. } { [%clk 0:01:06] } 28. Rf1 { [%eval -6.38] [%clk 0:00:15] } 28... Nf4 { [%eval -5.74] [%clk 0:01:06] } 29. Qc2?? { [%eval #-3] } { Checkmate is now unavoidable. Rc2 was best. } { [%clk 0:00:06] } 29... Re2 { [%eval #-7] [%clk 0:00:54] } 30. Qxe2 { [%eval #-6] [%clk 0:00:03] } 30... Nxe2+ { [%eval #-5] [%clk 0:00:55] } 0-1