English Opening: Symmetrical, Three Knights System

1.c4 c5 2.Nc3 Nf6 3.Nf3 b6 4.g3 Bb7 5.Bg2 g6 6.b3 Bg7 7.Bb2 O-O 8.O-O d5 9.Nxd5 Nxd5 10.Bxg7 Kxg7 11.cxd5 Qxd5 12.d4 cxd4