Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Qe7 4. d4 d6 5. Nf3 Qxe4+ 6. Be2 Nc6 7. O-O Bf5 8.
Bd3 Qd5 9. c4 Qa5 10. Bd2 Nb4 11. Bxb4 Qxb4 12. Bxf5 Qxc4 13. Na3 Qc6 14. Re1+
Be7 15. Nc2 a6 16. Nb4 Qb5 17. Qe2 Qxe2 18. Rxe2 a5 19. Rae1 O-O 20. Rxe7 axb4
21. Rxc7 Rxa2 22. Rxb7 Rxb2 23. Rb1 Rxb1+ 24. Bxb1 Nd5 25. Nd2 Rc8 26. Nc4 g6
27. Nxd6 *
Position (FEN): 2r3k1/1R3p1p/3N2p1/3n4/1p1P4/8/5PPP/1B4K1 b - - 0 27
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 703
Best move: Rc1#