Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. Bf4 e6 3. e3 Nf6 4. Nf3 c5 5. c3 Bd7 6. Nbd2 Be7 7. Ne5 O-O 8. Bd3
Qb6 9. Rb1 Bb5 10. Qe2 Bxd3 11. Qxd3 Nc6 12. O-O Nxe5 13. Bxe5 Nd7 14. Bg3 Bd6
15. a3 Rad8 16. b4 c4 17. Qc2 f6 18. e4 Bxg3 19. hxg3 Qd6 20. Rbd1 b5 21. Rfe1
a5 22. f4 axb4 23. axb4 Ra8 24. Nf3 Ra3 25. e5 fxe5 26. Nxe5 Nf6 27. Rc1 Rfa8
28. Nf3 Ra2 29. Qb1 Ne4 30. Rxe4 dxe4 31. Qxe4 Qd5 32. Qe3 Ra1 33. Rxa1 Rxa1+
34. Kh2 h6 35. Nh4 Rd1 36. f5 Rd3 37. Qf4 Rxc3 38. f6 Qg5 39. Qb8+ Kf7 40. fxg7
Qxg7 41. Qc7+ Kf6 42. Qf4+ Ke7 43. Qc7+ Kf8 44. Qc8+ Kf7 45. Qd7+ Kf6 46. Qd6
Qg4 47. Qe5+ Ke7 48. Qc7+ Kf6 49. Qe5+ Ke7 50. Nf3 Rxf3 51. gxf3 Qxf3 52. Qc7+
Kf6 53. Qe5+ Ke7 54. d5 Qxd5 55. Qg7+ Kd6 56. Qxh6 Ke5 *
Position (FEN): 8/8/4p2Q/1p1qk3/1Pp5/6P1/7K/8 w - - 1 57
White to move.
Themes:  Endgame, Queen Endgame Dovetail Mate, Mate in 1 
Puzzle rating: 1140
Best move: Qf4#