I have always assumed that the 'no two step in first move' is the reason of structure of all the _Indian defenses_: first move is a knight move followed by Bish

I have always assumed that the 'no two step in first move' is the reason of structure of all the _Indian defenses_: first move is a knight move followed by Bishop fianchetto. Most pawn moves are a single step pawn move. https://en.wikipedia.org/wiki/Indian_Defence https://en.wikipedia.org/wiki/Indian_Defence