Rook and Pawn Endgame Analysis

In Mark Dvoretsky's latest ChessCafe column, he deeply annotates a complex rook and pawn ending.

Dvoretsky writes as an introduction to his column:

Some time ago, I gave a chess seminar in Arizona, USA, where one of the participants showed me an endgame he had played. After the class, I analyzed the endgame with the aid of my computer program, and saw that it contained some difficult and instructive tasks. In trying to solve them, a player can train his calculating technique, and also practice and expand his knowledge of rook endings.