Chess puzzle (Checkmate)
Opening: Queens_Gambit_Accepted, Queens_Gambit_Accepted_Saduleto_Variation
Moves: 1. d4 d5 2. c4 dxc4 3. e4 e6 4. Nc3 Nc6 5. Nf3 Nf6 6. Bxc4 Be7 7. Bg5 O-O 8. h4
h6 9. Bxf6 Bxf6 10. e5 Be7 11. Qc2 a6 12. Ng5 Nxd4 *
Position (FEN): r1bq1rk1/1pp1bpp1/p3p2p/4P1N1/2Bn3P/2N5/PPQ2PP1/R3K2R w KQ - 0 13
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 818
Best move: Qh7#