Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Marshall_Gambit
Moves: 1. e4 e6 2. d4 d5 3. Nc3 c5 4. exd5 cxd4 5. Bb5+ Bd7 6. dxe6 fxe6 7. Bxd7+ Qxd7
8. Ne4 Qd5 9. Qg4 Nf6 10. Nxf6+ gxf6 11. Nf3 f5 12. Qh5+ Ke7 13. Bg5+ Kd6 14.
O-O-O Qxa2 15. Rxd4+ Kc6 16. Qe8+ Kb6 17. Bd8+ Ka6 18. Ra4+ Qxa4 *
Position (FEN): rn1BQb1r/pp5p/k3p3/5p2/q7/5N2/1PP2PPP/2K4R w - - 0 19
White to move.
Themes: Hanging Piece Middlegame Mate in 1 
Puzzle rating: 721
Best move: Qxa4#