Chess puzzle (Advantage)
Opening: Vienna_Game, Vienna_Game_Vienna_Gambit
Moves: 1. e4 e5 2. Nc3 Nc6 3. f4 d6 4. Bc4 Nf6 5. f5 b6 6. d3 Qd7 7. Nf3 Bb7 8. Bg5
Be7 9. Qe2 g6 10. fxg6 hxg6 11. Bb5 O-O-O 12. O-O-O a6 13. Ba4 b5 14. Nxb5 *
Position (FEN): 2kr3r/1bpqbp2/p1np1np1/1N2p1B1/B3P3/3P1N2/PPP1Q1PP/2KR3R b - - 0 14
Black to move.
Themes:  Middlegame  
Puzzle rating: 1398
Best move: axb5