Chess puzzle (Advantage)
Opening: Blackmar-Diemer_Gambit, Blackmar-Diemer_Gambit_Euwe_Defense
Moves: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 e6 6. Bg5 Be7 7. Bd3 Nc6 8.
Qd2 h6 9. Bf4 a6 10. O-O-O b5 11. Nxb5 *
Position (FEN): r1bqk2r/2p1bpp1/p1n1pn1p/1N6/3P1B2/3B1N2/PPPQ2PP/2KR3R b kq - 0 11
Black to move.
Themes:  Middlegame  
Puzzle rating: 1588
Best move: axb5