Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Marshall_Defense
Moves: 1. d4 d5 2. c4 Nf6 3. cxd5 Nxd5 4. Nf3 Nc6 5. e3 e5 6. dxe5 Bg4 7. Bb5 Qe7 8.
Bxc6+ bxc6 9. h3 Bxf3 10. Qxf3 Qxe5 11. O-O Bd6 12. Nc3 *
Position (FEN): r3k2r/p1p2ppp/2pb4/3nq3/8/2N1PQ1P/PP3PP1/R1B2RK1 b kq - 3 12
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1049
Best move: Qh2#