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Puzzles (3 cohencoins award for each match):

Puzzle WCOQO: 649

FEN
[Event " MrCohenOS Arena"] [Site "https://cohenchessclub.com/iDGRkn8N"] [Date "2026.04.06"] [White "Masterwill"] [Black "Sadie"] [Result "1-0"] [UTCDate "2026.04.06"] [UTCTime "23:46:59"] [WhiteElo "1482"] [BlackElo "1330"] [WhiteRatingDiff "+10"] [BlackRatingDiff "-10"] [BlackTitle "GM"] [Variant "Standard"] [TimeControl "420+2"] [ECO "C42"] [Opening "Russian Game"] [Termination "Normal"] [Annotator "cohenchessclub.com"] 1. e4 e5 2. Nf3 Nf6 3. Nxe5 { C42 Russian Game } Bd6? { (0.77 → 2.00) Mistake. d6 was best. } (3... d6 4. Nf3) 4. d4 Nxe4?? { (2.18 → 4.69) Blunder. Qe7 was best. } (4... Qe7 5. f3) 5. Qf3?? { (4.69 → 0.51) Blunder. Qg4 was best. } (5. Qg4) 5... Ng5?? { (0.51 → 2.92) Blunder. Nf6 was best. } (5... Nf6) 6. Qe3?? { (2.92 → 0.71) Blunder. Bxg5 was best. } (6. Bxg5 Qxg5) 6... O-O?? { (0.71 → 6.92) Blunder. Be7 was best. } (6... Be7) 7. Bd3?? { (6.92 → 0.45) Blunder. Qxg5 was best. } (7. Qxg5 Bb4+ 8. c3 f6 9. Qh4 fxe5 10. Qxd8 Rxd8 11. cxb4 d5 12. Na3 Nc6 13. dxe5 Re8) 7... Nc6?? { (0.45 → 6.20) Blunder. Ne6 was best. } (7... Ne6 8. c3 Be7 9. O-O d6 10. Nf3 Re8 11. c4 Bf6 12. Re1 Na6 13. a3 c6 14. Qe4) 8. Nf3?? { (6.20 → -3.49) Blunder. Qxg5 was best. } (8. Qxg5) 8... Re8 9. Qxe8+?? { (-3.29 → -8.66) Blunder. Nxg5 was best. } (9. Nxg5 Rxe3+ 10. Bxe3 g6 11. c3 Bf8 12. Nf3 Ne7 13. O-O d5 14. Bg5 Bg7 15. Nbd2 f6) 9... Qxe8+ 10. Be3 Bf4 11. O-O Nxf3+ 12. gxf3 d6 13. Re1 Nxd4 14. Nc3 Nxf3+ 15. Kf1 Nxe1 16. Rxe1 Bxe3 17. fxe3 Bh3+ 18. Ke2 Qe6 19. Kd1 Qg4+ 20. Kc1 Re8 21. Bb5 c6 22. Bc4 d5 23. Bd3 d4 24. Nd1 dxe3 25. Nxe3 Qf4 26. Kd2 Qf2+ 27. Kd1?! { (-10.90 → Mate in 9) Checkmate is now unavoidable. Re2 was best. } (27. Re2 Qf4) 27... Qf3+?! { (Mate in 9 → -10.90) Lost forced checkmate sequence. Bg4+ was best. } (27... Bg4+ 28. Re2 Bxe2+ 29. Kd2 Bxd3+ 30. Kc3 Rxe3 31. cxd3 Qe2 32. b3 Rxd3+ 33. Kb4 Qe7+ 34. Ka4) 28. Kd2 Bf1 29. Bxf1 Qxe3+?? { (-8.61 → 4.66) Blunder. Qf2+ was best. } (29... Qf2+ 30. Re2) 30. Rxe3 Rxe3 31. Kxe3 f5 32. Kf4 g5+ 33. Kxf5 h6 34. Kg6 b5 35. Kxh6 { Black resigns. } 1-0
Computer analysisMove timesCrosstableFEN & PGN
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