Chess puzzle (Checkmate)
Moves: 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ exf6 6. Nf3 Bd6 7. Bd3 O-O
8. O-O Re8 9. h3 Nd7 10. c3 Nf8 11. Qc2 Be6 12. c4 Ng6 13. Rd1 Qd7 14. Bf1 Bf5
15. Qb3 Re7 16. d5 c5 17. Bd2 Rae8 18. Re1 b6 19. Rxe7 Rxe7 20. Re1 Nf4 21.
Rxe7 Qxe7 22. Qe3 Kf8 23. Nh4 Bb1 24. a3 Qe5 25. Qxe5 Bxe5 26. Nf3 Bd6 27. Bc3
Ke7 28. Ne1 Be5 29. g3 Bxc3 30. bxc3 Ng6 31. Bd3 Bxd3 32. Nxd3 Kd6 33. f4 Ne7
34. g4 b5 35. cxb5 Kxd5 36. Nb2 c4 37. Kf2 Kc5 38. a4 Nd5 39. Nd1 Nxf4 40. h4
Ng6 41. h5 Ne5 42. Kg3 Nd3 43. Kf3 Ne5+ 44. Kf4 Nd3+ 45. Kf5 h6 46. Ke4 Ne5 47.
Ne3 g6 48. hxg6 fxg6 49. Kf4 Nd3+ 50. Ke4 Nb2 51. Nd5 f5+ 52. gxf5 gxf5+ 53.
Ke5 Nd3+ 54. Ke6 f4 55. Nf6 f3 *
Position (FEN): 8/p7/4KN1p/1Pk5/P1p5/2Pn1p2/8/8 w - - 0 56
White to move.
Themes:  Endgame, Knight Endgame Mate in 1 
Puzzle rating: 1979
Best move: Nd7#