Home › Openings › Nimzo-Indian Defense › Nimzo-Indian Defense: Rubinstein System › Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation, Main Line ECO E42 · 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Ne2 cxd4 6. exd4 O-O 7. a3 Related variationsNimzo-Indian Defense: Rubinstein System, Rubinstein Variation, Sherbakov Attack Practice this opening · Play against the computer