Chess puzzle (Checkmate)
Opening: Russian_Game, Russian_Game_Modern_Attack
Moves: 1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Nd5 5. Qxd4 Nb6 6. Nc3 Nc6 7. Qe4 Be7 8.
Bd3 d6 9. exd6 Qxd6 10. Nb5 Qd8 11. Bf4 O-O *
Position (FEN): r1bq1rk1/ppp1bppp/1nn5/1N6/4QB2/3B1N2/PPP2PPP/R3K2R w KQ - 4 12
White to move.
Themes: Kingside Attack Middlegame Mate in 1 
Puzzle rating: 646
Best move: Qxh7#