Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 c6 5. cxd5 exd5 6. Bg5 h6 7. Bh4 Bf5 8. e3
Qb6 9. Bd3 Qxb2 10. Bxf5 Qxc3+ 11. Kf1 Nbd7 12. Rb1 g5 13. Bg3 Nb6 14. Be5 Be7
15. h4 Rg8 16. hxg5 hxg5 17. Rh6 Ne4 18. g4 Qc4+ 19. Kg2 Nc3 20. Qh1 Nxb1 21.
Bxb1 O-O-O 22. Bf5+ Nd7 23. Bg3 f6 24. Rh7 Qb4 25. Qh6 Rgf8 26. Qg7 Rfe8 27.
Qf7 b6 28. Qe6 Kb7 29. Bg6 Nf8 30. Qf7 Nxg6 31. Qxg6 Ka6 32. Qd3+ Qc4 33. Qf5
Qxa2 34. Qe6 Bd6 35. Qxf6 Bxg3 36. Kxg3 Qc2 37. Rc7 Qe4 38. Nxg5 Qc2 39. Rxc6
Qd1 40. Nf3 Rf8 41. g5 Rxf6 42. Rxf6 Rg8 43. Kf4 Kb5 44. Rf5 a5 45. Rxd5+ Ka6
46. Rf5 a4 47. Ne5 Qg1 48. f3 a3 49. Ng4 a2 50. g6 a1=Q 51. Rf6 Qab1 52. e4
Qbc1+ 53. Kf5 Qg3 54. Ke6 Qg5 55. Ne5 Q3xe5+ 56. dxe5 Rxg6 57. f4 Qg4+ 58. f5
Rxf6+ 59. Kxf6 Qxe4 60. e6 Qd4+ 61. Kf7 Qg4 62. f6 Qh5+ 63. Kf8 Qh6+ 64. Ke7
Qh7+ 65. f7 Qh8 66. f8=Q Qh5 67. Qf7 Qh4+ 68. Ke8 Qg4 69. e7 *
Position (FEN): 4K3/4PQ2/kp6/8/6q1/8/8/8 b - - 0 69
Black to move.
Themes:  Endgame, Queen Endgame Mate in 1 
Puzzle rating: 850
Best move: Qc8#