Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. c3 Nc6 3. Qb3 a6 4. Bc4 Nh6 5. d3 Na5 6. Qd1 Nxc4 7. dxc4 g6 8. Nf3
Bg7 9. Bg5 f6 10. Bxh6 Bxh6 11. O-O d6 12. Nbd2 Be6 13. Kh1 Qe7 14. Qa4+ Bd7
15. Qb4 O-O 16. Qa3 f5 17. exf5 Bxf5 18. Rfe1 e4 19. Nf1 Qd7 20. Nd4 Bg4 21.
Kg1 c5 22. Nc2 Rae8 23. Nce3 Bxe3 24. Rxe3 Qf7 25. Rae1 Qxf2+ 26. Kh1 Qxf1+ 27.
Rxf1 *
Position (FEN): 4rrk1/1p5p/p2p2p1/2p5/2P1p1b1/Q1P1R3/PP4PP/5R1K b - - 0 27
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 661
Best move: Rxf1#