Sicilian Defense: Open, Najdorf, Opočenský Variation

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e5 7.Nb3 Be7 8.Bg5 Be6 9.Bxf6 Bxf6 10.Qd3 O-O 11.O-O-O