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 Nc6 5. Bxf6 exf6 6. d5 Ne7 7. Bc4 f5 8.
Nge2 a6 9. a4 Bd7 10. O-O b5 *
Position (FEN): r2qkb1r/2pbnppp/p7/1p1P1p2/P1B1p3/2N5/1PP1NPPP/R2Q1RK1 w kq - 0 11
White to move.
Themes:  Opening  
Puzzle rating: 1407
Best move: axb5