Here’s another carefully selected example from Dr. Nunn that shows how difficult King and Pawn endgames are. Take the following position for example, I doubt whether a strong GM could find the solution in blitz.
It’s white to play and win. Take your time and make an effort to discard the more obvious moves. Carefully scroll down if you need the answer.
Understanding Chess Endgames, pg.15.
McCreadyandChess 
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