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. g4 Bg6 6. g5 Nd5 7. Nge2 exf3 8.
Ng3 Nb4 9. Bd3 Nxd3+ 10. cxd3 Qxd4 11. Qxf3 Qxd3 *
Position (FEN): rn2kb1r/ppp1pppp/6b1/6P1/8/2Nq1QN1/PP5P/R1B1K2R w KQkq - 0 12
White to move.
Themes:  Opening  
Puzzle rating: 1256
Best move: Qxb7