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Puzzles (3 cohencoins award for each match):

Puzzle q48DD: 640

GM Nathan4 (1354) +7
FEN
[Event " MrCohenOS Arena"] [Site "https://cohenchessclub.com/3B2Maw6I"] [Date "2026.04.17"] [White "Nathan4"] [Black "Eitan1"] [Result "1-0"] [UTCDate "2026.04.17"] [UTCTime "23:37:54"] [WhiteElo "1354"] [BlackElo "1197"] [WhiteRatingDiff "+7"] [BlackRatingDiff "-5"] [WhiteTitle "GM"] [Variant "Standard"] [TimeControl "420+2"] [ECO "C42"] [Opening "Russian Game: Three Knights Game"] [Termination "Normal"] [Annotator "cohenchessclub.com"] 1. e4 e5 2. Nf3 Nf6 3. Nc3?! { (0.75 → 0.07) Inaccuracy. Nxe5 was best. } { C42 Russian Game: Three Knights Game } (3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4 Nf6 9. Nc3 O-O) 3... d6?! { (0.07 → 0.65) Inaccuracy. Nc6 was best. } (3... Nc6 4. Bb5 Bd6 5. O-O O-O 6. d3 Nd4 7. Ba4 Nxf3+ 8. Qxf3 c6 9. Bb3 a5 10. Kh1) 4. Bc4 Nc6? { (0.49 → 1.61) Mistake. Be7 was best. } (4... Be7 5. d4 exd4 6. Nxd4 c6 7. O-O O-O 8. a4 Nxe4 9. Nxe4 d5 10. Bd3 dxe4 11. Bxe4) 5. d3?? { (1.61 → 0.00) Blunder. Ng5 was best. } (5. Ng5 d5 6. exd5 Na5 7. Bb5+ c6 8. dxc6 bxc6 9. Be2 Nd5 10. d4 Nxc3 11. bxc3 Be7) 5... Be6?! { (0.00 → 0.56) Inaccuracy. Na5 was best. } (5... Na5 6. Bb3 Be7 7. O-O O-O 8. h3 h6 9. Re1 Nxb3 10. axb3 Re8 11. Bd2 Bf8 12. b4) 6. Bxe6 fxe6 7. Bg5 h6 8. Bxf6 gxf6?! { (-0.66 → 0.19) Inaccuracy. Qxf6 was best. } (8... Qxf6 9. Qe2) 9. O-O d5?? { (0.00 → 2.71) Blunder. Qd7 was best. } (9... Qd7 10. Nh4 O-O-O 11. f4 exf4 12. Ng6 Rg8 13. Nxf4 Bg7 14. Nce2 Ne7 15. d4 f5 16. d5) 10. exd5 exd5 11. d4 exd4? { (1.82 → 3.30) Mistake. Qe7 was best. } (11... Qe7 12. Nxd5) 12. Nxd4 Nxd4 13. Qxd4 c5?? { (2.96 → 7.09) Blunder. c6 was best. } (13... c6 14. Rae1+ Kf7 15. Qg4 Rg8 16. Qe6+ Kg7 17. Re3 Kh8 18. Ne2 Qd6 19. Qh3 Qb4 20. Ng3) 14. Qe3+ Qe7 15. Qxe7+? { (8.06 → 3.73) Mistake. Qh3 was best. } (15. Qh3 Qf7 16. Rfe1+ Be7 17. Re6 f5 18. Rae1 O-O-O 19. Rxe7 Rhe8 20. Rxe8 Rxe8 21. Rf1 Qd7) 15... Bxe7 16. Nxd5 Bd6? { (3.64 → 6.07) Mistake. Kf7 was best. } (16... Kf7) 17. Nxf6+ Ke7 18. Nd5+ Ke6 19. Nc7+?? { (7.22 → -4.54) Blunder. Rad1 was best. } (19. Rad1 Rhe8) 19... Bxc7 20. Rae1+ Be5?? { (-4.19 → 6.84) Blunder. Kf7 was best. } (20... Kf7 21. g3) 21. f4 Kd5 22. Rxe5+ Kd6 23. Rd1+ Kc6 24. c4 Rad8 25. Rxd8 Rxd8 26. Re6+ Kd7 27. Rxh6 Rf8 28. Rh5 Kc6 29. Rd5? { (7.91 → 4.46) Mistake. g3 was best. } (29. g3 b5) 29... Rxf4 30. b3?! { (3.75 → 2.89) Inaccuracy. h3 was best. } (30. h3 Rxc4) 30... Re4? { (2.89 → 5.62) Mistake. b5 was best. } (30... b5 31. g3) 31. Rg5 Re2?! { (5.47 → 7.46) Inaccuracy. a6 was best. } (31... a6 32. Rg6+) 32. Rg6+ Kc7 33. Rg7+ Kc6 34. a4 Rb2 35. Rg6+ Kc7 36. Rg3 b6 37. h4 a6 38. h5 Rd2 39. h6 Rd7 40. Rg7 Rxg7 41. hxg7 b5 42. cxb5 axb5 43. axb5 Kb6 44. g8=Q Kxb5 45. Qb8+ Ka5 46. Kf2 Ka6 47. Ke3 Ka5 48. Kd3 Ka6 49. Kc4 Ka5 50. Qb5# { White wins by checkmate. } 1-0
Computer analysisMove timesCrosstableFEN & PGN
Reconnecting