@forcedinductionretard there's a chance the opponent also opened their edge pawn so if you want to move your own edge pawn further so you can fit your rook behind it'll start the skirmish before you can continue with your positioning

1st file rook is a thing but the rook stays on the starting row behind the pawn instead of moving the central pawn out twice, moving the rook out, moving the edge pawn out twice, then fitting in the rook
that's 2 moves compared to 7