I am Kingscrusher on Youtube - with over 6000 subscribers there and counting up rapidly. I'm ECF 199, and FIDE 2170.
I am currently video annotating some Nimzovich games from Carlsbad 1929, from the perspective of the evolution of style. Here is his win vs. Mattison:
Lessons to learn here:
Doubled pawns, Restraint in particular. The early use of the Nimzo-Indian defence.