Chess puzzle (Advantage)
Opening: Bishops_Opening, Bishops_Opening_Boden-Kieseritzky_Gambit
Moves: 1. e4 e5 2. Nf3 Nf6 3. Bc4 Nxe4 4. Nc3 Nxc3 5. dxc3 d6 6. Ng5 Be6 7. Nxe6 fxe6
8. Bxe6 Qe7 9. Bb3 Nc6 10. O-O O-O-O 11. h4 Qxh4 12. Be6+ Kb8 13. Be3 Ne7 14.
a4 Ng6 15. a5 Nf4 *
Position (FEN): 1k1r1b1r/ppp3pp/3pB3/P3p3/5n1q/2P1B3/1PP2PP1/R2Q1RK1 w - - 1 16
White to move.
Themes:  Middlegame  
Puzzle rating: 2174
Best move: a6