The other day I was looking at an old book, Chess Combination as a fine art (a collection of chess columns by Kurt Richter).
I stumbled on an exercise I had marked years ago.
Richter took it from a Belgian chess column, but could not trace the source.
Today we know, thanks to the excellent Endgame Studies Database IV compiled by Harold van der Heijden:
The following position looks easy.
But there are surprises galore.
W. von Holzhausen, Rigaer Tageblatt 1912