Home › Openings › Nimzo-Indian Defense › Nimzo-Indian Defense: Classical Variation › Nimzo-Indian Defense: Classical Variation, Berlin Variation Nimzo-Indian Defense: Classical Variation, Berlin Variation, Macieja System ECO E39 · 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 O-O 6. a3 Bxc5 7. Nf3 b6 Related variationsNimzo-Indian Defense: Classical Variation, Berlin Variation, Pirc VariationNimzo-Indian Defense: Classical Variation, Berlin Variation, Steiner Variation Practice this opening · Play against the computer