Almost 300 000 engine games as well as 30 000 games culled from the Mega 2019 + the Correspondence Database 2018 constitute the basis for the Nimzo-Indian Powerbook 2019. If you want to play for a win with Black against 1.d4 then hardly any opening is as well suited to the purpose as the Nimzo-Indian: it is rare for symmetrical positions to arise and not much is exchanged, instead of that exciting distributions of material often appear on your board. White requires patience. To be sure he can frequently obtain the bishop pair, but that does not necessarily promise him an advantage.
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The Nimzo-Indian Powerbook 2019 is based on almost 300 000 games from the Engine Room and a good 30 000 played by human beings, coming to a total of over 327 000 games. The threshold for players is Elo 2450, but generally speaking the average is in the 2550-2600 range. Thus the Powerbook also offers reliable statistics in deep sub-variations.
The move 4.e3 still accounts for the greatest number of games. The position in the following diagram is then very frequently reached:
Now the older 7...Nc6 can lay claim to very good statistics, but if one goes deeper into the tree structure White just manages to get an edge in some branches. But the alternative 7...dxc4 8.Bxc4, and then either 8...Nbd7 or 8...cxd4 should reliably provide a level game.