Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Modern_Variations
Moves: 1. e4 c5 2. Nf3 d6 3. Bc4 Nc6 4. d4 cxd4 5. Nxd4 g6 6. b3 Bg7 7. Bb2 Qb6 8. c3
Nf6 9. Nd2 O-O 10. O-O Na5 11. Bd3 a6 12. c4 Nd7 13. Qc1 *
Position (FEN): r1b2rk1/1p1nppbp/pq1p2p1/n7/2PNP3/1P1B4/PB1N1PPP/R1Q2RK1 b - - 2 13
Black to move.
Themes:  Opening  
Puzzle rating: 1097
Best move: Bxd4