Beginners only tend to be interested in learning endgames if you can show them how useful they are. And for successful coaching it is highly desirable that your students are interested in learning!
Accordingly this article is aimed at beginners only. I will demonstrate how knowing or learning an endgame can help in making the right exchanges.
Black to play and win
This position is taken from one of my internet games. This position looks even at a first glance but it is completely winning for Black.
Hint: The king and pawn endgame is the best way to realize the material advantage.
Forcing the knight to c5.
The only move. Now what?
The simplest solution that forces exchanges.
If 2…Bxc5 then 3. Bxc5! drops a pawn but retains drawing chances for White. The same is true of 3.Nxc5. Note that 3.bxc5 leads to a winning king and pawn endgame for Black after exchanges on f2 because White’s king can’t protect the c5 pawn and the pawn is within the reach of Black’s king (Rule of Square).
The point, winning a pawn and forcing exchanges. My opponent resigned here in view of 4.bxc5 Bxc5 when the rook is pinned. Black can take the rook on next move and resulted position will be an easy win because of the extra pawn in a king and pawn endgame.