Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Bowdler_Attack
Moves: 1. e4 c5 2. Bc4 Nf6 3. d3 e5 4. Bg5 Be7 5. Nc3 O-O 6. Nf3 d6 7. O-O Nc6 8. a3
Bg4 9. Bxf6 Bxf6 10. h3 Bxf3 11. Qxf3 Nd4 12. Qd1 Nc6 13. Nd5 Na5 14. Ba2 b5
15. Qd2 Nc6 16. c4 b4 17. axb4 cxb4 18. Nxb4 *
Position (FEN): r2q1rk1/p4ppp/2np1b2/4p3/1NP1P3/3P3P/BP1Q1PP1/R4RK1 b - - 0 18
Black to move.
Themes:  Middlegame  
Puzzle rating: 1905
Best move: Qa5