Chess puzzle (Advantage)
Opening: Bishops_Opening, Bishops_Opening_Vienna_Hybrid
Moves: 1. e4 e5 2. Nc3 Nc6 3. Bc4 Nf6 4. d3 h6 5. f4 exf4 6. Bxf4 d6 7. Nf3 Bg4 8. O-O
Nd4 9. Qd2 Nxf3+ 10. gxf3 Be6 11. Nd5 Be7 12. Qg2 g5 13. Be3 Qd7 14. Qg3 Nxd5
15. Bxd5 Bxd5 16. exd5 O-O-O 17. Bxa7 b6 18. a4 Kb7 19. a5 Kxa7 *
Position (FEN): 3r3r/k1pqbp2/1p1p3p/P2P2p1/8/3P1PQ1/1PP4P/R4RK1 w - - 0 20
White to move.
Themes: Double Check Middlegame  
Puzzle rating: 771
Best move: axb6+