Chess puzzle (Checkmate)
Opening: Philidor_Defense, Philidor_Defense_Exchange_Variation
Moves: 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 Nf6 5. Nc3 h6 6. Bb5+ Bd7 7. Bxd7+ Nbxd7
8. f3 a6 9. Bf4 Qe7 10. Qd2 O-O-O 11. O-O d5 12. Rad1 dxe4 13. Nxe4 Nxe4 14.
fxe4 Qxe4 15. Qc3 c6 16. Qa5 b6 *
Position (FEN): 2kr1b1r/3n1pp1/ppp4p/Q7/3NqB2/8/PPP3PP/3R1RK1 w - - 0 17
White to move.
Themes: Queenside Attack Middlegame Mate in 1 
Puzzle rating: 825
Best move: Qxa6#