Certainly not the group of kids I coached today. To emphasise the importance of calculation in selecting moves I decided to work through a number of studies and endings. One of the positions I showed them is the one given here. It is by Horwitz from 1851, and while the arrangement of pawns gives a big clue in how the solution is going to look, it still got a big laugh from the group when we reached the end of the 24 move(!) main line.
White to play and win