Chess puzzle (Checkmate)
Moves: 1. e4 c5 2. f4 d6 3. Nf3 g6 4. Nc3 Bg7 5. Bc4 Nc6 6. O-O e6 7. d3 Nge7 8. a4
O-O 9. Kh1 d5 10. exd5 exd5 11. Bb3 Bg4 12. h3 Bxf3 13. Qxf3 Nd4 14. Qg3 Nxb3
15. cxb3 Nf5 16. Qf2 Nd4 17. Ra3 Re8 18. Be3 b6 19. Nb5 Nf5 20. Bc1 a6 21. Nc3
Bd4 22. Qf3 Qh4 23. Kh2 Be3 24. Nxd5 Bxc1 25. Rxc1 Rad8 26. g3 Re2+ 27. Qxe2
Qxg3+ 28. Kh1 Rxd5 29. Qg4 Qe3 30. Rg1 Rxd3 31. b4 c4 32. Rxd3 Qxd3 33. Rd1
Qe4+ 34. Kh2 Ne3 35. Rd8+ Kg7 36. Qg5 Qc2+ 37. Kg3 Qg2+ 38. Kh4 Qxg5+ 39. fxg5
Nd1 40. Rd6 Nxb2 41. Rxb6 Nxa4 42. Rxa6 Nb2 43. Rc6 Nd3 44. b5 Ne5 45. Rc8 h5
46. b6 f5 47. b7 f4 48. Rc7+ Kf8 49. Rc8+ Ke7 50. Rc7+ Ke6 51. Rc6+ Kd7 52.
b8=Q *
Position (FEN): 1Q6/3k4/2R3p1/4n1Pp/2p2p1K/7P/8/8 b - - 0 52
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 1400
Best move: Nf3#