Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Modern_Variation
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 dxc4 5. e3 Nbd7 6. Bxc4 h6 7. Bxf6 Qxf6 8.
Nf3 e5 9. dxe5 Nxe5 10. Nxe5 Qxe5 11. O-O Bd6 12. Nb5 *
Position (FEN): r1b1k2r/ppp2pp1/3b3p/1N2q3/2B5/4P3/PP3PPP/R2Q1RK1 b kq - 3 12
Black to move.
Themes: Kingside Attack Middlegame Mate in 1 
Puzzle rating: 694
Best move: Qxh2#