Chess puzzle (Checkmate)
Moves: 1. e4 e6 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nf6 5. Be3 d6 6. Bd3 Nc6 7. O-O O-O 8. a3
b6 9. Qd2 Ne7 10. Bh6 Kh8 11. Bxg7+ Kxg7 12. Rfe1 d5 13. Ne5 dxe4 14. Nxe4 Nxe4
15. Bxe4 Rb8 16. Re3 c5 17. Rd1 cxd4 18. Rh3 h5 19. Rxh5 gxh5 20. Qg5+ Ng6 21.
Qxh5 Qf6 22. Nxg6 fxg6 23. Bxg6 Qxg6 24. Qe5+ Qf6 25. Qxb8 Qxf2+ 26. Kh1 Qf1+
27. Rxf1 *
Position (FEN): 1Qb2r2/p5k1/1p2p3/8/3p4/P7/1PP3PP/5R1K b - - 0 27
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 500
Best move: Rxf1#