A staircase

In "Tasks: The cumulative principle in problem composition" republished as "Classic Chess Exercises", Alain White gives the above example of a staircase.

"Here we have another example of a consecutive White piece journey...The WQ starts from the ground floor of her house, and goes slowly upstairs to the very top. She then throws herself out of the window, to the street below, possibly with a view to suicide; and surprises herself as much as anybody else that by so doing she has really succeeded in mating her old enemy, the Black King, who has been kicking his heels on the street corner."

ha ha