Chess puzzle (Checkmate)
Moves: 1. e4 e6 2. Nf3 d5 3. e5 c5 4. Bb5+ Bd7 5. Nc3 Qb6 6. a3 Bxb5 7. Nxb5 Qxb5 8.
d3 Nc6 9. c3 Nge7 10. O-O Ng6 11. Re1 Qb6 12. Bg5 Qc7 13. d4 cxd4 14. cxd4 Qb6
15. b4 Be7 16. Be3 O-O 17. Ng5 Qd8 18. Qh5 Bxg5 19. Bxg5 Qb6 20. Bf6 Nxd4 21.
Bg5 Nxe5 22. Rxe5 f6 23. Bxf6 Rxf6 24. Rg5 Nc2 25. Rc1 Qxf2+ 26. Kh1 Qf1+ 27.
Rxf1 *
Position (FEN): r5k1/pp4pp/4pr2/3p2RQ/1P6/P7/2n3PP/5R1K b - - 0 27
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 440
Best move: Rxf1#