Grigoriev Study

As mentioned in "To Know a Position" yesterday, a 1921 study by Nikolai Grigoriev appears in several books, especially Dvoretsky's Endgame Manual and Alex Fishbein, King and Pawn Endings. However, I did not find the study with that date in Harold van der Heijden, Endgame Study Database VI. Rather, the position is flipped and the date given is 1924. Otherwise, it is the same position.

White to move

White must play precisely to draw.