Bishop, Knight and King vs Lone King
Jeremy Silman in his book 'Silman's Complete Endgame Course' makes the statement that this Endgame isn't worth learning as it will only come up at most about 3 times in one's lifetime or possibly not ever at all. But it shouldn't take long for most to Master and it also teaches useful Bishop and Knight Co-ordination techniques. So I think it is worth learning. I remember sitting down about a year ago and just practicing it for an hour against Fritz. That was all it took for me to become proficient at it..
I think it was in the most recent Olympiad where even a player rated over 2400 didn't know how to win such an Endgame! Which must have obviously been rather embarrassing?
I played such an Endgame against one of my students shortly after I learned it around a year ago. It will definitely be useful to look at for anyone who doesn't know how to pull off such a mate. All my annotations are from a year ago as well and done for my student:
There are also some useful videos on youtube.com demonstrating this Endgame.
ian