Chess puzzle (Checkmate)
Opening: Queens_Gambit_Accepted, Queens_Gambit_Accepted_Old_Variation
Moves: 1. d4 d5 2. c4 dxc4 3. e3 b5 4. a4 Bd7 5. Qf3 c6 6. axb5 e5 7. Bxc4 Nf6 8. dxe5
Bg4 9. Qf4 *
Position (FEN): rn1qkb1r/p4ppp/2p2n2/1P2P3/2B2Qb1/4P3/1P3PPP/RNB1K1NR b KQkq - 2 9
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 743
Best move: Qd1#