Event: Campeonato Nacional Senior 2025
Site: Comité Olímpico Nacional, Coronado, Costa Rica
White: Cersosimo Bolanos, Francisco
WhiteElo: 1974
Black: Mena Vilchez, Ulises
BlackElo: 1718
Result: 1/2-1/2
ECO: B21
Opening: Sicilian Defense: McDonnell Attack
Variant: Standard
TimeControl: 90+30

1. e4 { [%eval 0.18] [%clk 1:30:57] } 1... c5 { [%eval 0.25] [%clk 1:30:45] } 2. f4 { [%eval 0.0] [%clk 1:31:00] } 2... Nc6 { [%eval 0.0] [%clk 1:30:18] } 3. Nf3 { [%eval 0.0] [%clk 1:31:20] } 3... d6 { [%eval 0.0] [%clk 1:29:31] } 4. Nc3 { [%eval 0.0] [%clk 1:30:26] } 4... a6 { [%eval 0.39] [%clk 1:25:13] } 5. d3 { [%eval -0.06] [%clk 1:30:04] } 5... Bg4 { [%eval 0.37] [%clk 1:23:54] } 6. h3 { [%eval 0.44] [%clk 1:30:14] } 6... Bxf3 { [%eval 0.17] [%clk 1:23:48] } 7. Qxf3 { [%eval 0.24] [%clk 1:30:33] } 7... e5?! { [%eval 0.95] } { Inaccuracy. g6 was best. } { [%clk 1:23:56] } 8. f5 { [%eval 0.52] [%clk 1:28:07] } 8... Nd4 { [%eval 0.67] [%clk 1:24:13] } 9. Qf2 { [%eval 0.68] [%clk 1:27:03] } 9... Be7 { [%eval 0.82] [%clk 1:19:25] } 10. Nd5 { [%eval 0.89] [%clk 1:26:05] } 10... Nf6 { [%eval 0.81] [%clk 1:15:43] } 11. Nxe7?! { [%eval 0.07] } { Inaccuracy. Nxf6+ was best. } { [%clk 1:25:44] } 11... Qxe7?! { [%eval 0.94] } { Inaccuracy. Qa5+ was best. } { [%clk 1:13:54] } 12. c3 { [%eval 1.03] [%clk 1:25:57] } 12... Nc6 { [%eval 1.01] [%clk 1:13:21] } 13. g4 { [%eval 0.78] [%clk 1:24:11] } 13... h6 { [%eval 0.7] [%clk 1:13:15] } 14. Bg2 { [%eval 0.56] [%clk 1:24:25] } 14... Rb8 { [%eval 0.74] [%clk 1:02:29] } 15. Be3 { [%eval 0.76] [%clk 1:22:58] } 15... b5 { [%eval 0.74] [%clk 1:02:24] } 16. Qc2 { [%eval 0.77] [%clk 1:18:57] } 16... Qc7 { [%eval 0.79] [%clk 0:59:02] } 17. O-O { [%eval 0.79] [%clk 1:18:05] } 17... Ne7 { [%eval 1.19] [%clk 0:51:50] } 18. Qf2 { [%eval 0.83] [%clk 1:14:46] } 18... b4 { [%eval 0.81] [%clk 0:47:35] } 19. Rfc1 { [%eval 0.74] [%clk 1:05:53] } 19... Qa5 { [%eval 0.78] [%clk 0:41:27] } 20. a3 { [%eval 0.37] [%clk 0:59:56] } 20... b3?! { [%eval 1.27] } { Inaccuracy. bxc3 was best. } { [%clk 0:39:16] } 21. Bf3 { [%eval 1.2] [%clk 0:55:31] } 21... Qa4 { [%eval 1.23] [%clk 0:31:44] } 22. Qe2 { [%eval 0.88] [%clk 0:48:48] } 22... g5?! { [%eval 1.62] } { Inaccuracy. Nc6 was best. } { [%clk 0:25:46] } 23. Kg2 { [%eval 1.55] [%clk 0:35:44] } 23... Rc8 { [%eval 2.14] [%clk 0:16:46] } 24. Rh1 { [%eval 2.21] [%clk 0:31:38] } 24... d5 { [%eval 2.33] [%clk 0:12:26] } 25. exd5 { [%eval 2.33] [%clk 0:31:27] } 25... Nexd5 { [%eval 2.48] [%clk 0:11:23] } 26. Bxd5?? { [%eval 0.0] } { Blunder. c4 was best. } { [%clk 0:31:15] } 26... Nxd5 { [%eval 0.0] [%clk 0:11:42] } 27. Rhf1? { [%eval -1.17] } { Mistake. c4 was best. } { [%clk 0:18:38] } 27... Qb5? { [%eval 0.19] } { Mistake. O-O was best. } 28. Bxg5?? { [%eval -4.04] } { Blunder. Bd2 was best. } { [%clk 0:18:38] } 28... Qc6 { [%eval -4.14] [%clk 0:10:27] } 29. Be3?! { [%eval -6.29] } { Inaccuracy. Qxe5+ was best. } { [%clk 0:18:37] } 29... Qa4?? { [%eval 2.15] } { Blunder. Nf4+ was best. } { [%clk 0:10:26] } 30. Rh1?! { [%eval 1.17] } { Inaccuracy. f6 was best. } { [%clk 0:17:32] } 30... Qc6 { [%eval 1.25] [%clk 0:10:46] } 31. Bg5?? { [%eval -8.26] } { Blunder. Kf2 was best. } { [%clk 0:18:37] } 31... Qa4?? { [%eval 6.2] } { Blunder. Nf4+ was best. } { [%clk 0:11:14] } 32. Bxh6?? { [%eval -1.51] } { Blunder. Qxe5+ was best. } { [%clk 0:18:37] } 1/2-1/2