Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Najdorf_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nb3 Be7 8. Bd3
Be6 9. Qd2 Nc6 10. f3 b5 11. Be2 d5 12. O-O-O *
Position (FEN): r2qk2r/4bppp/p1n1bn2/1p1pp3/4P3/1NN1BP2/PPPQB1PP/2KR3R b kq - 1 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1268
Best move: d4