E41: Nimzo-Indian, e3, Huebner variation

E41 Sub-variants:

• Nimzo-Indian, 4.e3 c5
  1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5
• Nimzo-Indian, e3, Huebner variation
  1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 Nc6 6. Nf3 Bxc3+ 7. bxc3 d6