Chess puzzle (Checkmate)
Moves: 1. d4 c5 2. e3 cxd4 3. exd4 g6 4. c3 Bg7 5. f4 Nf6 6. Nf3 O-O 7. Bd3 d5 8. O-O
Nc6 9. Ne5 Ne4 10. Nd2 Nd6 11. Qe1 f6 12. Nxc6 bxc6 13. Nf3 Nf7 14. Qg3 Qc7 15.
a3 Bd7 16. Qh4 Rab8 17. b4 Rbe8 18. Bd2 e5 19. fxe5 fxe5 20. Nxe5 Nxe5 21. Bf4
Qc8 22. Bxe5 Rxf1+ 23. Rxf1 Bxe5 24. dxe5 Rxe5 25. Qf6 Qe8 26. c4 Re1 27. cxd5
Rxf1+ 28. Qxf1 Qe3+ 29. Kh1 cxd5 30. Be2 Bf5 31. Bf3 Be4 32. Bxe4 Qxe4 33. Qc1
d4 34. Qc8+ Kg7 35. Qc7+ Kh6 36. Qxa7 *
Position (FEN): 8/Q6p/6pk/8/1P1pq3/P7/6PP/7K b - - 0 36
Black to move.
Themes:  Endgame, Queen Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 634
Best move: Qb1#