Best response to the Nimzo-Indian Defense: Classical Variation, Noa Variation (E36)

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 · Black to move

What is the best response to the Nimzo-Indian Defense: Classical Variation, Noa Variation (1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3)? Black to move. See the top replies ranked by opening theory and real-game results.

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