Chess puzzle (Checkmate)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Chigorin_Variation
Moves: 1. Nf3 d5 2. d4 Nc6 3. e3 Bf5 4. Bd3 Bxd3 5. Qxd3 Nf6 6. a3 a6 7. O-O Qd6 8. b3
e5 9. dxe5 Nxe5 10. Nxe5 Qxe5 11. Qd4 Bd6 12. Bb2 *
Position (FEN): r3k2r/1pp2ppp/p2b1n2/3pq3/3Q4/PP2P3/1BP2PPP/RN3RK1 b kq - 3 12
Black to move.
Themes: Kingside Attack Middlegame Mate in 1 
Puzzle rating: 666
Best move: Qxh2#