Dacha Tactics #25 - dark nugget incoming!

From a blitz game of mine in a wild time scramble! The material is about equal – let's look for color. So we have a light bishop vs a rook. This means we are ahead on light, but behind on dark. White's king is precarious, but alas, it stands on a dark square. How to replenish our dark and finish him off?

Interact with the puzzle below. If you get stuck, you can always click the "lightbulb" icon in the lower-left of the puzzle frame. Good luck!

Watch IM Yaacov solve and explain the puzzle in the video below.