Chess puzzle (Checkmate)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Mason_Variation
Moves: 1. d4 d5 2. Bf4 e6 3. Nf3 Nf6 4. Nbd2 Nc6 5. c4 Nb4 6. Qa4+ Bd7 7. Qb3 a5 8. c5
b6 9. cxb6 cxb6 10. Rc1 a4 11. Qc3 Nxa2 12. Qc7 Nxc1 13. Qxc1 Rc8 14. Qa1 a3
15. bxa3 Bxa3 16. Qxa3 Qe7 17. Bd6 Qxd6 18. Qxd6 *
Position (FEN): 2r1k2r/3b1ppp/1p1Qpn2/3p4/3P4/5N2/3NPPPP/4KB1R b Kk - 0 18
Black to move.
Themes:  Middlegame Back Rank Mate, Mate in 1 
Puzzle rating: 595
Best move: Rc1#