The principle of one diagonal
This is very important in bishop endings. If the bishop has all jobs on one diagonal
it can not be diverted and not fall into zugzwang, if the diagonal is long enough:
Breaking the blockade
When fighting only on one wing a knight is often superior to a bishop:
Melia's Marches
Opposite colored bishop endings have a very large drawish tendency, but the following
case is so close that great care is required:
Homerun of the h-pawn
A dangeous passed pawn is very dangerous in the endgame:

Karsten Müller in ChessBase Magazine
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