Chess puzzle (Checkmate)
Opening: Van_Geet_Opening, Van_Geet_Opening_Sicilian_Two_Knights
Moves: 1. Nf3 c5 2. Nc3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nxc6 bxc6 6. h4 Nf6 7. Bg5 Bb4 8.
e4 Qa5 9. Bxf6 gxf6 10. Qd2 Rb8 11. a3 Rg8 12. Be2 Rxg2 13. Bf3 Rg6 14. O-O-O
Bxa3 15. bxa3 *
Position (FEN): 1rb1k3/p2p1p1p/2p1ppr1/q7/4P2P/P1N2B2/2PQ1P2/2KR3R b - - 0 15
Black to move.
Themes: Queenside Attack Middlegame Mate in 1 
Puzzle rating: 675
Best move: Qxa3#