Stejn v. Bilek — an interesting endgame study

In the following position, it is white to move.  White has a clear advantage, but how to proceed?  This position is taken from sahovski informator’s “encyclopedia of chess middlegames,” which is basically just a beautiful hardbound tactics book with positions from actual games categorized according to motifs.  Hint: the theme of this problem is “interception.”

I will post the answer in the comments after a few days if no one guesses it.


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