Chess puzzle (Advantage)
Opening: Modern_Defense, Modern_Defense_Other_variations
Moves: 1. e4 g6 2. d4 Bg7 3. c4 d6 4. Nf3 Nd7 5. Nc3 e5 6. d5 a5 7. a3 Nc5 8. Be3 b6
9. b4 axb4 10. axb4 Rxa1 11. Qxa1 Nb7 12. Be2 f5 13. O-O f4 14. Bd2 g5 15. c5
Nxc5 16. bxc5 bxc5 17. Qa6 *
Position (FEN): 2bqk1nr/2p3bp/Q2p4/2pPp1p1/4Pp2/2N2N2/3BBPPP/5RK1 b k - 1 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 981
Best move: Bxa6