Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. Bf4 Nf6 3. e3 c5 4. Nf3 Nc6 5. Nbd2 e6 6. c3 cxd4 7. cxd4 Bd6 8.
Bg3 O-O 9. a3 b6 10. Bd3 Bb7 11. O-O Bxg3 12. hxg3 Rc8 13. b4 Qd6 14. Rc1 Ne7
15. Ne5 Nd7 16. f4 Nb8 17. Kf2 Rxc1 18. Qxc1 f6 19. Nef3 Nd7 20. Rh1 h6 21. Bb5
Rc8 22. Qb1 Bc6 23. Bxc6 Qxc6 24. Ke2 Nf5 25. Kf2 Qc3 26. Re1 Qxa3 27. Qa1 Qxa1
28. Rxa1 Rc7 29. g4 Nd6 30. Ke2 Nb5 31. g5 hxg5 32. fxg5 Rc3 33. g4 Kf7 34.
gxf6 gxf6 35. g5 fxg5 36. Nxg5+ Ke7 37. Rh1 Nf6 38. Ndf3 Rc2+ 39. Kd1 Ra2 40.
Rh6 Nc3+ 41. Ke1 Re2+ 42. Kf1 Rxe3 43. Ne5 Nce4 44. Ng6+ Kd6 45. Nf7+ Kc6 46.
Nd8+ Kd7 47. Rh8 Rg3 48. Ne5+ Kc7 49. Nxe6+ Kd6 50. Nd8 Ra3 51. Rf8 Ke7 52.
Ng6+ Kd6 53. Rf7 a5 54. b5 a4 55. Nf4 Ra1+ 56. Kg2 a3 *
Position (FEN): 3N4/5R2/1p1k1n2/1P1p4/3PnN2/p7/6K1/r7 w - - 0 57
White to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 1369
Best move: Nb7#