I believe that is the Rubinstein Variation, one of the most popular responses to the Nimzo Indian. I recommend the Classical Variation 4. Qc2 because is supports the e4 square and does not ruin your pawn structure. I don't prefer playing against the Nimzo Indian so I play the Torre Attack
if u play 3 e3 instead of 3 nc3 you avoid getting clogged up and u can play 4 nc3 which transforms into the rubenstien variation and then you dont get doubled up porns
anyone played 3 e3 before????
does it give u an advantage??