Nimzo-Indian Defense: Hübner Variation

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Bd3 Nc6 6.Ne2 cxd4 7.exd4 d5 8.O-O dxc4 9.Bxc4 O-O 10.a3