Pawns are the soul of chess.In my post, "Dominquez--Aronian, Tata Steel 2014", I mentioned that Levon Aronian's play in that game offered a modern lesson in the meaning of Philidor's famous dictum. This morning I looked at Aronian -- Ponomariov, Tsaghkadzar 2015, Chess Informant 124/9, and found another illustration. The game as a whole is a good illustration of piece play in the service of creating powerful passed pawns.
François-André Danican Philidor
Here is one of the final critical positions.
White to move
What would you play?
Aronian sacrificed the exchange to get the a-pawn rolling. Ponomariov resigned ninen moves later.