Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Old_Sicilian
Moves: 1. e4 c5 2. Nf3 Nc6 3. Nc3 d6 4. Bc4 e6 5. d4 cxd4 6. Nxd4 a6 7. O-O Nf6 8. Bg5
Be7 9. h3 O-O 10. f4 *
Position (FEN): r1bq1rk1/1p2bppp/p1nppn2/6B1/2BNPP2/2N4P/PPP3P1/R2Q1RK1 b - - 0 10
Black to move.
Themes:  Opening  
Puzzle rating: 1962
Best move: Qb6