Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Closed
Moves: 1. e4 e6 2. Nc3 c5 3. d4 cxd4 4. Qxd4 Nc6 5. Qe3 Bb4 6. a3 Ba5 7. b4 Bb6 8. Qg3
Bd4 9. Bb2 Nf6 10. O-O-O O-O 11. Nf3 e5 12. b5 *
Position (FEN): r1bq1rk1/pp1p1ppp/2n2n2/1P2p3/3bP3/P1N2NQ1/1BP2PPP/2KR1B1R b - - 0 12
Black to move.
Themes:  Opening  
Puzzle rating: 1720
Best move: Bxc3