At what playing strength level should one be able to mate with King Bishop and Knight vs King? As in title above, at what playing strength level should one be able to mate with King, Bishop and Knight vs King without much effort (with reasonable time left for the game)?
A member of my club, rated about 1900 FIDE, had this in a championship blitz game about 2 years ago with 30 seconds left on the clock. He delivered mate with time to spare. IMs  have failed. Go figure. If you study and learn then you should be able to deliver mate. If you don't study then you won't. Playing strength doesn't have that much to do with it.