Endgame Study - I. Akobia and S. Didukh, 2010, Ural Problemist
The highlight of this study is the mutual zz position after 5. Rf6! Unfortunately for him, black is on move and perishes. In the try line 1. Rb7+? the same position arises with white on move and leads to a draw. The rook double in the diagram is a technical device to change the tempo between the real play and the try!

Kxc6 f2 a1:Q Kd2 and the f pawn draws, see this video: https://www.youtube.com/watch?v=xhx__YPzz5c
Drag the pieces to solve!