Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nbd7 7. O-O c5 8. d5
a6 9. a4 Rb8 10. e4 Nb6 11. Qe2 Bg4 12. h3 Bd7 13. Be3 Qc7 14. Nd2 Nc8 15. f4
b5 16. axb5 axb5 17. cxb5 Ne8 18. e5 dxe5 19. fxe5 Bxe5 20. Nde4 Ned6 21. Nxc5
Bxb5 22. Nxb5 Rxb5 23. Rac1 Rxb2 24. Qf3 Bg7 25. Nd3 Rc2 26. Nb4 Rxc1 27. Rxc1
Qd7 28. Nc6 Re8 29. Bf1 e5 30. dxe6 Rxe6 31. Bc4 Nxc4 32. Rxc4 Nd6 33. Rc1 Nf5
34. Bf4 Bd4+ 35. Nxd4 Nxd4 36. Qa8+ Kg7 37. Qa1 Re4 38. Rd1 f5 39. Rxd4 Rxd4
40. Be5+ Kf7 41. Qxd4 Qc6 42. Kf2 Qc2+ 43. Kf3 Qc6+ 44. Kf4 Qc1+ 45. Qe3 Qf1+
46. Qf3 Qc1+ 47. Qe3 Qf1+ 48. Kg5 h6+ 49. Kxh6 Qxh3+ 50. Kg5 Qh5+ 51. Kf4 *
Position (FEN): 8/5k2/6p1/4Bp1q/5K2/4Q1P1/8/8 b - - 3 51
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 901
Best move: Qg4#