Endgame Study #19: Stop the Pawns!

Hello everyone, and welcome back to my daily endgame studies! As always, there will be a small hint and a big hint if you scroll down (I space them out so that you cannot see them if you're just looking at the diagram/puzzle). Reminder: tomorrow's study (Study #20) is a prize problem! First 5 people tomorrow to post "solved" on that post will get an award. I will post it at around 10-11 am EST.

Scroll down for hints

Small hint: Watch out for all of black's defensive resources! Does he have to promote to a queen?
 

Big hint: You have to temporarily stop black's pawn from queening. Use your knight and bishops to try to achieve that. (The title of this blog post is "Stop the Pawns!" )

I hope you guys enjoyed this endgame study!