English Opening: King's English Variation

1.c4 e5 2.g3 Nf6 3.Bg2 d5 4.cxd5 Nxd5 5.Nc3 Nb6 6.Nf3 Nc6 7.O-O Be7 8.a3 O-O 9.b4 Be6 10.d3 a5 11.b5 Nd4 12.Nd2