Why is 2.g3 supposed to be the best setup for white against the Dutch? Compare these two positions:
With the move 1…f5 black deprived the Bc8 from the most natural diagonal for development. The only active square for that bishop is b7. If white plays 2.g3, he stops exactly that, the fianchetto of the black light-squared bishop.
The question is if this concept can be translated to other openings. Let’s look at it!
Does it still surprise you that Morozevich has played b3 against the Sicilian and b6 against the English?