Chess puzzle (Checkmate)
Opening: Modern_Defense, Modern_Defense_Other_variations
Moves: 1. e4 g6 2. Nf3 Bg7 3. d4 Nc6 4. Be3 d6 5. Nc3 Bd7 6. Qd2 e6 7. O-O-O Bf6 8.
Kb1 a5 9. Bd3 Nb4 10. e5 dxe5 11. dxe5 Be7 12. Be4 c6 13. a3 b5 14. axb4 axb4
15. Na2 Qa5 16. c3 b3 17. Qxd7+ Kf8 18. Nb4 *
Position (FEN): r4knr/3Qbp1p/2p1p1p1/qp2P3/1N2B3/1pP1BN2/1P3PPP/1K1R3R b - - 2 18
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1181
Best move: Qa1#