Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Other_variations
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nc6 5. Be2 e6 6. Nc3 a6 7. O-O Nf6 8. Bg5
Bd7 9. f4 *
Position (FEN): r2qkb1r/1p1b1ppp/p1nppn2/6B1/3NPP2/2N5/PPP1B1PP/R2Q1RK1 b kq - 0 9
Black to move.
Themes:  Opening  
Puzzle rating: 1356
Best move: Qb6