Dacha Tactics #23 - Reti vs Romanovsky light magic.

A complex endgame we have here. Since there are opposite colored bishops, the color money swings are real and palpable. White is +$1000 light, Black is +$1000 dark. F5 is under some pressure, and if fxe6 then ooops!-- f5 mates us. How to break black on light, and show him light is ours?

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!