The position is taken from the master game Colle - Gruenfeld, Carlsbad 1929.
Although the position is a draw after 1...Kd3! Black did not see it and he resigned instead :-((
If 2.Kg5 Ke4 3.Kxh5 Kf5 and the h pawn will not promote.
What can we learn from this example?
A) We need to study the endgames. It is a sad story to play a good opening & a fine middlegame if you play a poor endgame.
B) Sometimes even masters can lose relatively easy positions in the endgame.
(The source of this endgame is "Van Perlo's Endgame Tactics" excellent book.)