Chess puzzle (Checkmate)
Moves: 1. e4 e6 2. d3 d5 3. exd5 exd5 4. Nf3 Bg4 5. Be2 Nf6 6. O-O Be7 7. Nc3 c5 8. a3
Nc6 9. Bf4 a6 10. Bg3 O-O 11. Re1 Re8 12. Ne5 Nxe5 13. Bxe5 Bxe2 14. Rxe2 Bd6
15. Bxd6 Qxd6 16. Rxe8+ Rxe8 17. Qd2 h6 18. Re1 Rxe1+ 19. Qxe1 Ng4 20. g3 d4
21. Ne4 Qe5 22. Qa5 Qh5 23. h4 Qf5 24. Qd8+ Kh7 25. Qd6 c4 26. Qxd4 cxd3 27.
cxd3 Ne5 28. Qe3 Nf3+ 29. Kg2 Ne5 30. f4 Ng4 31. Qf3 Nf6 32. g4 Nxg4 33. Kg3 h5
34. Ng5+ Kh6 35. Qe4 Qxe4 36. dxe4 f6 37. Nf7+ Kg6 38. Nd6 b6 39. f5+ Kh6 40.
a4 g5 41. hxg5+ Kxg5 *
Position (FEN): 8/8/pp1N1p2/5Pkp/P3P1n1/6K1/1P6/8 w - - 0 42
White to move.
Themes:  Endgame, Knight Endgame Mate in 1 
Puzzle rating: 400
Best move: Nf7#