Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Modern_Variations
Moves: 1. e4 c5 2. Nf3 d6 3. Bc4 Nc6 4. O-O Nf6 5. d3 g6 6. Nc3 Bg7 7. h3 O-O 8. Bg5
a6 9. a3 Qc7 10. Bxf6 Bxf6 11. Nd5 Qd8 12. Nxf6+ exf6 13. c3 Be6 14. Qb3 Na5
15. Qa4 *
Position (FEN): r2q1rk1/1p3p1p/p2pbpp1/n1p5/Q1B1P3/P1PP1N1P/1P3PP1/R4RK1 b - - 4 15
Black to move.
Themes:  Middlegame  
Puzzle rating: 1613
Best move: b5