Nimzo-Indian Defense: Hübner, Main Line

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Bd3 Nc6 6.Nf3 Bxc3+ 7.bxc3 d6 8.e4 e5 9.d5 Ne7