A two-deck classic: 104 cards, ten columns and eight foundations. It takes patience and planning.
Forty Thieves is one of the most famous two-deck solitaires — also known as “Napoleon at St. Helena,” from the legend that the exiled emperor passed the time with it. The name likely comes from the 40 cards dealt to the tableau (ten columns of four), an echo of Ali Baba’s forty thieves.
It is famous for its difficulty: you build down by the same suit only, move one card at a time, and there is no redeal — many deals simply have no solution. It is a game for planners.
Its fame produced a large family of variants that adjust the difficulty: Josephine (named after Napoleon's wife) lets you move whole sequences; Forty and Eight adds a redeal; and Australian Patience is the single-deck version.