Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. Nf3 b6 3. c4 Bb7 4. Nc3 e6 5. Qc2 Bb4 6. Ne5 O-O 7. e3 d6 8. Nd3
Bxc3+ 9. bxc3 c5 10. f3 Nc6 11. Be2 Rc8 12. O-O Na5 13. Nf4 cxd4 14. cxd4 Nxc4
15. Bxc4 d5 16. Ba3 Rxc4 17. Qd3 Re8 18. Rfc1 Ba6 19. Rxc4 Bxc4 20. Qc3 Qd7 21.
Nd3 Bxd3 22. Qxd3 Rc8 23. Rc1 Rxc1+ 24. Bxc1 Qc8 25. Bd2 Qc4 26. Qa3 Qc7 27.
Qa4 g5 28. e4 h6 29. e5 Nd7 30. h4 gxh4 31. Bxh6 h3 32. gxh3 f6 33. exf6 Qg3+
34. Kf1 Qxf3+ 35. Kg1 Nxf6 36. Bd2 Qg3+ 37. Kf1 Qxh3+ 38. Ke1 Qh1+ 39. Ke2 Qe4+
40. Kd1 Kf7 41. Qxa7+ Kg6 42. Qxb6 Ng4 43. Qb3 Nf2+ 44. Kc1 Nd3+ 45. Kd1 e5 46.
Qb6+ Kh5 47. Qh6+ Kg4 48. Qg5+ Kf3 49. Qh5+ Kg2 50. Qg5+ Kf1 51. dxe5 *
Position (FEN): 8/8/8/3pP1Q1/4q3/3n4/P2B4/3K1k2 b - - 0 51
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 2029
Best move: Qa4#