Chess puzzle (Advantage)
Moves: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nc3 Bb4 6. f3 O-O 7. Bg5 Bxc3+ 8.
bxc3 d5 9. Nxc6 bxc6 10. e5 Re8 11. f4 Qd7 12. Be2 Ne4 13. Qd3 a5 14. Qf3 Nxg5
15. fxg5 Rxe5 16. O-O Rxg5 17. Rae1 Rf5 18. Qg3 Rxf1+ 19. Bxf1 Ba6 *
Position (FEN): r5k1/2pq1ppp/b1p5/p2p4/8/2P3Q1/P1P3PP/4RBK1 w - - 1 20
White to move.
Themes:  Endgame  
Puzzle rating: 1159
Best move: Bxa6