Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Dragon_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. d4 Nf6 4. Nc3 cxd4 5. Nxd4 g6 6. Bc4 Bg7 7. Bb3 Nc6 8.
Be3 O-O 9. f3 Bd7 10. Qd2 Rc8 11. O-O-O Nxd4 12. Bxd4 b5 13. h4 a5 14. a4 bxa4
15. Nxa4 Bxa4 16. Bxa4 Rc4 17. Bxf6 Rxa4 18. Bxg7 *
Position (FEN): 3q1rk1/4ppBp/3p2p1/p7/r3P2P/5P2/1PPQ2P1/2KR3R b - - 0 18
Black to move.
Themes:  Middlegame Back Rank Mate, Mate in 1 
Puzzle rating: 1076
Best move: Ra1#