National Master Caleb Denby continues his new series on the f3 Variation of the Nimzo-Indian. In part 3, learn about the perplexing bishop retreat to either e7 or d6.
2020.11.09
Hikaru Nakamura vs Magnus Carlsen, Zurich Chess Challenge (2014): E20 Nimzo-Indian, Kmoch variation
https://www.chessgames.com/perl/chessgame?gid=1745310