Rook Ending Lessons: Minev 1985
Simple Rook Endings never cease to amaze. A position which appeared so mysterious suddenly in 2 or 3 moves becomes so clear. I think with Rook endings, given how many possible moves there are at each branch, if you don't have a clear plan of what you're trying to achieve you can't "fall" into the exact line.
I encountered this position from from Chess Informant's Encyclopadia of Endings Rooks Diagram 58 Minev 1985.
Minev 1985: White to move
My Original attempt
The defence I missed
The ideal position
This is the setup that White strives for. His Rook is in front of his King to guard against checks, and can himself prepare to give a check along the d-file to drive the Black King back.
How to get to the ideal setup