Last week’s endgame study (Yochanan Afek 1973) solves like this:
1. Rxb5+! Kxb5 2. Ne5+ Ka4 3. Nd7 Be2! 4. Bxe2 Rb8+ 5. Bb5+!! (5. Ka2 Rb2+! 6. Kxb2 is stalemate) 5… Rxb5+ 6. Ka2 and Black is in zugzwang: the rook will be lost either by a capture or a fork.
My review of How to Study Chess on your Own by Davorin Kuljasevic, my source for this and other recent puzzles, is now available here.