Petrosian - and the better pawnstructure!

So please look at the following pawnstructure.

It is clear, white has the better one! He has a protected passed pawn at d5 and black pawn at c5 is a "weak" one. Would do you think about endgames with that pawnstructure? Right, they are in most of the times won by white. Only with a white "bad bishop" ( a whitesquared one ) it would presumly a draw.

So let us first have a look at the pawnending:

So let us look at a second endgame with that pawnstructure:

Believe me, the other endgames except that ones with the "bad bishop" are not better. So after this excursion it should be easy to understand Petrosian`s move in following position: It has something to do with pawnstructure you just have seen

So creating such pawnstructure Petrosian had winning endgames in his mind. A very efficient strategy!