Chess puzzle (Advantage)
Opening: Scotch_Game, Scotch_Game_Scotch_Gambit
Moves: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 h6 5. O-O Bc5 6. c3 d3 7. Qxd3 d6 8. Be3
Bxe3 9. Qxe3 Bg4 10. Qf4 Nf6 11. Nbd2 Qe7 12. Rfe1 O-O-O 13. h3 Bxf3 14. Nxf3
Ne5 15. Nxe5 dxe5 16. Qe3 a6 17. Rad1 Nd7 18. Qa7 Nb6 19. Bxa6 *
Position (FEN): 2kr3r/Qpp1qpp1/Bn5p/4p3/4P3/2P4P/PP3PP1/3RR1K1 b - - 0 19
Black to move.
Themes:  Middlegame  
Puzzle rating: 1539
Best move: bxa6