Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. d5 e5 3. dxe6 fxe6 4. e3 d5 5. Bd2 Nc6 6. Bc3 e5 7. Bb5 Qd6 8.
Bxc6+ bxc6 9. Nf3 Ba6 10. Bxe5 Qe7 11. b3 Ng4 12. Bb2 Nf6 13. Ne5 Qe6 14. Nc3
Bd6 15. Nxc6 Bb7 16. Nd4 Qf7 17. Ndb5 O-O 18. Nxd6 cxd6 19. Qd3 Ne4 20. f3 Nxc3
21. Bxc3 Rae8 22. O-O-O Re6 23. f4 Rfe8 24. Bd2 d4 25. exd4 Bxg2 26. Rhg1 Be4
27. Qg3 g6 28. h4 Rc8 29. c3 h5 30. Rde1 Qf5 31. Qg5 Qf7 32. Qg3 Qf5 33. Rg2
Bxg2 34. Rxe6 Qxe6 35. Qxg2 Re8 36. Qf3 Qe2 37. Qc6 Qe7 38. Qd5+ Kh7 39. f5
Qxh4 40. fxg6+ Kxg6 41. Qxd6+ Qf6 42. Qg3+ Kh7 43. Qc7+ Re7 44. Qg3 Rg7 45.
Qd3+ Kg8 46. Qc4+ Kh8 47. Qc8+ Kh7 48. Qa8 Rg1+ 49. Kc2 Qf5+ 50. Kb2 Rb1+ 51.
Ka3 *
Position (FEN): Q7/p6k/8/5q1p/3P4/KPP5/P2B4/1r6 b - - 20 51
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 663
Best move: Qa5#