Phalanx of Pawns

Petrosian knows how to make the most of a small advantage. He takes one, transforms it into another, and yet another. Eventually, his centralization allows him to start a flank attack with his pawns. After his rook manages to make it to the 7th rank, the end swiftly comes.

And just for fun, a chess puzzle:

EDIT: oh, and NM-or-bust has the right idea! but he has yet to post the complete solution.

chicken12-not quite.