The most common aim in an endgame is to queen a pawn. This is why it is often a good idea to advance your pawns if you can do so safely. If you move them nearer the promotion square, you can often threaten to promote them.
In this week’s problem, White can queen one of his pawns. He can crash a pawn through.
How does White to play win?
The solution to last Monday’s problem is that White plays 1 Bd5. Black takes the Bishop and White then plays Kb7 and then Kc6 and Kc5 and wins the endgame.