Bishop shuts down Knight

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Last night I had a lesson with Chess Expert Jeff Caveney and while I got many things out of the lesson one thing really hit home. Where can you place the Bishop that it threatens all the Knights if they move?

You can see more on trapping the Knight in Pandolfini's Book. by clicking the link.
Caveat: Please do not complain about the position it is an example and did not occur in a real game. It is just to show a principle.