Chess puzzle (Advantage)
Opening: Blackmar-Diemer_Gambit, Blackmar-Diemer_Gambit_Vienna_Variation
Moves: 1. d4 Nf6 2. Nc3 d5 3. e4 dxe4 4. f3 Bf5 5. fxe4 Bxe4 6. Nxe4 Nxe4 7. Qf3 Qxd4
8. Bd3 Nc5 9. Ne2 Nxd3+ 10. cxd3 Qb4+ 11. Bd2 Qxb2 12. O-O Qxd2 13. Qxf7+ Kd8 *
Position (FEN): rn1k1b1r/ppp1pQpp/8/8/8/3P4/P2qN1PP/R4RK1 w - - 1 14
White to move.
Themes: Defensive Move Middlegame  
Puzzle rating: 2227
Best move: Nf4