Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. c4 dxc4 3. Nc3 e6 4. e4 Nc6 5. Nf3 Nf6 6. e5 Nd5 7. Bxc4 Nxc3 8.
bxc3 Be7 9. O-O O-O 10. Bd3 b6 11. Be3 Bb7 12. Qc2 g6 13. Be4 Rb8 14. Rfd1 f5
15. exf6 Bxf6 16. Bxg6 hxg6 17. Qxg6+ Bg7 18. Ng5 Rf6 19. Qh7+ Kf8 20. d5 exd5
21. Qh5 Qe7 22. Nh7+ Kg8 23. Nxf6+ Qxf6 24. Qxd5+ Kh7 25. Qe4+ Kg8 26. Qc4+ Kh7
27. Bd4 Nxd4 28. Rxd4 Bh6 29. Qd3+ Kg8 30. Rg4+ Bg7 31. Rd1 Rf8 32. Qc4+ Rf7
33. f3 c5 34. Rd7 Bc8 35. Rxg7+ Kxg7 36. Qg4+ Qg6 37. Rxf7+ Kxf7 38. Qxc8 Qb1+
39. Kf2 Qxa2+ 40. Kg3 Qe6 41. Qc7+ Qe7 42. Qf4+ Qf6 43. Qc4+ Qe6 44. Qa6 Qe5+
45. Kh3 Qe6+ 46. g4 Qd7 47. Kg3 Qc7+ 48. Kh3 c4 49. g5 Kg6 50. f4 Qxf4 51. Qxa7
Qxg5 52. Qxb6+ Kh5 53. Qf2 *
Position (FEN): 8/8/8/6qk/2p5/2P4K/5Q1P/8 b - - 2 53
Black to move.
Themes:  Endgame, Queen Endgame Mate in 1 
Puzzle rating: 939
Best move: Qg4#