Chess puzzle (Checkmate)
Opening: Queens_Gambit_Accepted, Queens_Gambit_Accepted_Old_Variation
Moves: 1. d4 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 a6 5. Bd3 e6 6. Nf3 c5 7. dxc5 Bxc5 8.
O-O Nc6 9. Qe2 Qc7 10. e4 Ng4 11. h3 Nd4 12. Nxd4 *
Position (FEN): r1b1k2r/1pq2ppp/p3p3/2b5/3NP1n1/3B3P/PP2QPP1/RNB2RK1 b kq - 0 12
Black to move.
Themes:  Opening Mate in 1 
Puzzle rating: 1015
Best move: Qh2#