Chess puzzle (Checkmate)
Moves: 1. c4 c6 2. Nf3 d5 3. e3 e6 4. b3 Qf6 5. d4 Bb4+ 6. Nbd2 Ne7 7. Bb2 Qg6 8. Ne5
Qh6 9. Bd3 Bd6 10. Nef3 f5 11. Qc2 a5 12. h3 Na6 13. a3 O-O 14. Ne5 b5 15. cxb5
cxb5 16. Bxb5 f4 17. Ng4 Qg5 18. Nf3 Qh5 19. e4 dxe4 20. Qxe4 Nd5 21. Bc6 Rb8
22. Nge5 Rxb3 23. Rb1 Bxa3 24. Bxa3 Rxa3 25. Bxd5 exd5 26. Qxd5+ Kh8 27. Qd6
Qf5 28. Qxa3 Qxb1+ 29. Ke2 Qb5+ 30. Kd2 Nb4 31. Rc1 Ba6 32. Nc4 Re8 33. Nfe5
Nc6 34. Nxc6 Qxc6 35. Qc5 Qxg2 36. d5 Bxc4 37. Rxc4 Qxh3 38. Rxf4 Qh6 39. Qe3
Rxe3 *
Position (FEN): 7k/6pp/7q/p2P4/5R2/4r3/3K1P2/8 w - - 0 40
White to move.
Themes:  Endgame, Queen and Rook Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 820
Best move: Rf8#