Endgame Training 4

This is a 2-Rooks vs. 1-Rook puzzle from my daily practice. Rather than just memorizing the moves of the solution, the solution is explained by steps. When the reasons behind each phase of the solution are known, the knowledge can be applied to similar situations. The solution is the shortest as verified by the endgame database. Comments are my own.

P.S. When Wilhelm Steinitz was asked how he could give Rook odds to a particular opponent, he replied “It is not I who gives him a Rook. Look at his games and you will see that he never moves his Queen’s Rook and Queen’s Knight. He is conceding me a Knight.”