Calculation (card game)
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Calculation (also known as Broken Intervals,[1] Hopscotch[2] and Four Kings Solitaire[3]) is a solitaire card game played with a standard pack of 52 cards.[4] It is part of the Sir Tommy family of patience games. It has its origin in France, where it is known as La Plus Belle.[5]
It offers more scope for skill than many similar games; a skilled player can win Calculation more than 80% of the time when "normal play" can allow winning 1 in 5 times.[6] Good strategy typically sees players use 6s, 8s, and Queens early and 10s, Jacks, and Kings later; clever placement of cards in the waste is also critical, with some players reserving one waste pile for the Kings. [7] Every game of Calculation Solitaire is winnable.[citation needed] The key is to focus on putting cards in the 'waste piles' in reverse order.