Chess puzzle (Checkmate)
Moves: 1. e4 e6 2. d4 d5 3. Nd2 c5 4. Ngf3 cxd4 5. Nxd4 Nc6 6. Bb5 Bd7 7. Nxc6 Bxc6 8.
Bd3 Nf6 9. Qe2 dxe4 10. Nxe4 Be7 11. O-O O-O 12. Rd1 Qc7 13. Bd2 Nxe4 14. Bxe4
Bxe4 15. Qxe4 Bf6 16. Bf4 Qb6 17. Be5 Bxe5 18. Qxe5 Rfd8 19. h4 f6 20. Qe4 Qc6
21. Qb4 Qc7 22. Qb3 Kf7 23. h5 h6 24. c3 b6 25. Qc2 Rxd1+ 26. Rxd1 Rd8 27. Qg6+
Kf8 28. Rxd8+ Qxd8 29. Qg4 Kf7 30. g3 Qd5 31. c4 Qd2 32. Qg6+ Kf8 33. Qe4 Qd1+
34. Kg2 Qxh5 35. Qxe6 Qf7 36. Qc8+ Ke7 37. b4 Kd6 38. c5+ bxc5 39. Qxc5+ Ke6
40. a4 Qb7+ 41. Kg1 g5 42. b5 h5 43. a5 h4 44. gxh4 gxh4 45. b6 axb6 46. axb6
h3 47. Qc4+ Kd6 48. Qb4+ Kc6 49. Qc3+ Kb5 50. Qxf6 *
Position (FEN): 8/1q6/1P3Q2/1k6/8/7p/5P2/6K1 b - - 0 50
Black to move.
Themes:  Endgame, Queen Endgame Mate in 1 
Puzzle rating: 871
Best move: Qg2#