Chess puzzle (Advantage)
Opening: Blackmar-Diemer_Gambit, Blackmar-Diemer_Gambit_Netherlands_Variation
Moves: 1. d4 d5 2. e4 dxe4 3. Nc3 f5 4. f3 exf3 5. Qxf3 e6 6. Nh3 Qxd4 7. Be3 Qg4 8.
Qf2 Nf6 9. Be2 Qb4 10. O-O-O Bd6 11. Nb5 Be5 *
Position (FEN): rnb1k2r/ppp3pp/4pn2/1N2bp2/1q6/4B2N/PPP1BQPP/2KR3R w kq - 10 12
White to move.
Themes:  Middlegame  
Puzzle rating: 2160
Best move: Bd4