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Klondike (solitaire)

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Klondike is a single-player card game belonging to the solitaire family. It is widely considered the most popular and well-known version of solitaire. In the United States and Canada, the name "Solitaire" usually refers specifically to Klondike. In the United Kingdom, players often call it "Patience" or "American Patience." It is recognized for being a challenging game that requires strategic thinking.

The game uses a standard 52-card deck without any Jokers. To begin, a player creates a tableau of seven fanned piles. These piles are laid out from left to right in a triangular pattern. The first pile on the left contains one card, and each subsequent pile contains one more card than the previous one. The topmost card of every pile is turned face up. The remaining cards from the deck are placed face down in a pile called the stock.

Thoughtful Solitaire
Thoughtful Solitaire

Players aim to build four foundation stacks. These stacks are built by suit, starting with the Ace and ending with the King. To move cards within the tableau, players must follow a rule of alternating colors. This means a red card must be placed on a black card, or vice versa. Any face-up card, or group of cards acting as a unit, can be moved to another tableau pile if it follows this color rule. Empty spaces in the tableau can only be filled by a King or a sequence of cards starting with a King. The game ends when all four foundations are complete or when no more moves are possible.

Klondike lost game
Klondike lost game

There are several ways to deal the stock to the waste pile. Some rules involve turning three cards at once with unlimited passes through the deck. Other versions require turning only one card at a time. Some variations limit the player to only three passes through the deck. These different rules change how difficult the game becomes. The difficulty is a key part of why players enjoy the challenge of Klondike.

The history of the name "Klondike" is not fully certain. Some authors suggest it relates to the late 19th-century Klondike Gold Rush. However, there is no material evidence to prove this connection. The earliest recorded rules appeared in a 1907 edition of Hoyle's Games as "Seven-Card Klondike." By 1913, the name changed to "Klondike" and the rules were modified. In America, the game was once called "Canfield." This name may have come from the Canfield Casino in Saratoga Springs, New York. In England, "Canfield" refers to a completely different patience game called "Demon."

Calculating the exact probability of winning Klondike is very difficult. Mathematician Persi Diaconis called this difficulty one of the "embarrassments of applied probability." In a version called "Thoughtful Klondike," where the location of all cards is known, the win rate is about 81.942%. However, regular Klondike is harder because players cannot see the face-down cards. One study showed a skilled human player could win about 43% of games. Computer algorithms have different success rates depending on the rules used. For example, an AI using Monte Carlo tree search solved about 35% of random games. Another algorithm had a 52% win rate in "turn one" mode but only 18% in "turn three" mode.

Many different variants of the game exist. "Agnes" is an American version where the stock is dealt in batches of seven. "Easthaven" uses seven piles of three cards each. "Nine Across" uses nine columns instead of seven. Other versions like "Somerset" or "Whitehead" change how cards are dealt or how they are built. There are even ways to play with more than one person. "Double Solitaire" allows two players to share foundations using their own decks.

Klondike lost game
Klondike lost game

Computers have helped make Klondike extremely popular. Microsoft included it in the Windows operating system starting with Windows 3.0 in 1990. For many people, playing Klondike was their first way to learn how to use a computer mouse. In the digital version, players can earn points for specific moves. For example, moving a card from the waste to the tableau earns 5 points. Moving it from the tableau to a foundation earns 10 points. Players can even earn bonus points for finishing a timed game quickly.

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