Pawn majority on the Queen side
In the following diagram you can see a very typical pawn structure. White has on the queen side a pawn majority and can create an outside passer, but will this be enough for a win in a pawn endgame? Tal believed and proved it!
So we have seen that in pawn endgames with this pawn structure are good winning chances for the one with the pawn majority on queen side. This means, that there should be also an advantage in endgames with pieces. The one who is playing against the pawn majority can`t easily agree exchanging pieces, because of the "bad" pawn endgame. Here an example:
Colle-Koltanowski is an opening which often creates "our"" pawn structure. Here an example White went directly from opening into an favorable endgame with the pawn majority on queen side