E36: Nimzo-Indian, classical, Noa variation, 5.a3

E36 Sub-variants:

• Nimzo-Indian, classical, Noa variation, 5.a3
  1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3
• Nimzo-Indian, classical, Botvinnik variation
  1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Nc6
• Nimzo-Indian, classical, Noa variation, main line
  1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4