Chess puzzle (Advantage)
Opening: Blackmar-Diemer_Gambit, Blackmar-Diemer_Gambit_von_Popiel_Gambit
Moves: 1. e4 d5 2. d4 dxe4 3. Nc3 Nf6 4. Bg5 Bf5 5. Qd2 e6 6. O-O-O Nc6 7. f3 exf3 8.
Nxf3 Bb4 9. Bb5 Qd6 10. Ne5 Nd5 11. g4 Be4 *
Position (FEN): r3k2r/ppp2ppp/2nqp3/1B1nN1B1/1b1Pb1P1/2N5/PPPQ3P/2KR3R w kq - 1 12
White to move.
Themes:  Middlegame  
Puzzle rating: 1941
Best move: Qf2