Chess puzzle (Advantage)
Opening: Blackmar-Diemer_Gambit, Blackmar-Diemer_Gambit_Vienna_Variation
Moves: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 Bf5 5. fxe4 Nxe4 6. Nxe4 Bxe4 7. Nf3 e6 8.
c3 Bd6 9. Bg5 f6 10. Bh4 Nc6 11. Bd3 Bxd3 12. Qxd3 Qe7 13. Qb5 Qd7 14. b3 e5
15. Qxb7 Rb8 16. Qa6 exd4 17. Nxd4 *
Position (FEN): 1r2k2r/p1pq2pp/Q1nb1p2/8/3N3B/1PP5/P5PP/R3K2R b KQk - 0 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 1506
Best move: Nxd4