Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. Bf4 Nf6 7. Qc2 cxd4 8.
Nb5 Bb4+ 9. Bd2 a6 10. Nbxd4 O-O 11. Nxc6 Bxd2+ 12. Qxd2 bxc6 13. e3 Ne4 14.
Qc2 Qd6 15. Bd3 Rb8 16. b3 Qb4+ 17. Nd2 f5 18. Bxe4 fxe4 19. O-O c5 20. Rac1
Bf5 21. Qxc5 Qxd2 22. Rfd1 Qxa2 23. Qxd5+ Kh8 24. Rc7 Be6 25. Qxe6 Qxf2+ 26.
Kh1 Qf1+ 27. Rxf1 *
Position (FEN): 1r3r1k/2R3pp/p3Q3/8/4p3/1P2P3/6PP/5R1K b - - 0 27
Black to move.
Themes:  Endgame, Queen and Rook Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 600
Best move: Rxf1#