First

Today's puzzle has to have a flaw in it because it seems so good.  I know that the bishop taking the knight would not affect in any way the position of the former so why not do it? Because there has to be a question to the importance of taking that piece at that time but it seems unlikely because the point of chess is to invoke a checkmate so why wait to win.  I dont know.  Having frustrations with this one.

If Black's bishop captures the White Knight, the White king is in stalemate and can't move, so its a draw