«Klondike» solitaire - the most popular card game. For the layout of the solitaire, a deck of 52 cards is taken and decomposed into seven columns so that there is one card in the first column, and seven in the last. All the cards in the columns are closed, and only the topmost cards in each column are placed open. Remaining from the initial distribution, a part of the deck is put side by side and used later in the analysis of solitaire. The aim of the game is to spread out the cards in pairs in four piles in ascending order, from Ace to King.