Thumb And Pouch

Klondike, also known as Canfield, is a card game for one player and the best known and most popular version of the patience or solitaire family, something which "defies explanation" as it has one of the lowest rates of success of any such game.Parlett (1979), pp. 94–95. Partly because of that, it has spawned numerous variants including Batsford, Easthaven, King Albert, Thumb and Pouch, Somerset or Usk and Whitehead, as well as the American variants of the games, Agnes and Westcliff. The distinguishing feature of all variants is a triangular layout of the tableau, building in ascending sequence and packing in descending order.Coops (1939), p. 10.

Name

In the U.S. and Canada, it is so well known that the term Solitaire, in the absence of qualifiers, typically refers to Klondike. Equally in the UK, it is often just known as "Patience". Elsewhere the game is known as American Patience.

Historically Klondike was also called Canfield in America, perhaps because it was a casino game at the Canfield Casino in Saratoga Springs, New York, and this is the name by which it became known in England. Today, however, Canfield is more usually the American name for the patience game called " Demon" in England, which is a different game altogether. Likewise the rumour prevails that this other game was devised by Richard Canfield even though Canfield himself called his game "Klondike".

History

According to Tung (2015), the game became popular in the late 19th century, and may well have been named "Klondike" after the Canadian region where the Klondike Gold Rush happened in 1896–1899. The earliest rules for the game known as Klondike today appear in the 1907 edition of ''Hoyle's Games'' under the name "Seven-Card Klondike". ''Hoyles'' calls it a simpler version of "Klondike", also described in the same book, but which turns out to be a gambling version of the game nowadays known as Canfield in the US and Demon elsewhere in the world.

In the 1913 edition of the so-called ''Official Rules of Card Games'', Seven-Card Klondike has become Klondike, with the modification that the pack is run through one card at a time instead of three, and the original Klondike is now being called Canfield.

Klondike's inclusion in Microsoft Windows in the 1990s contributed significantly to its current popularity. It is considered the most popular version of solitaire, which "defies explanation" as the chances of success in getting it out (i.e. winning) are one of the lowest of any patience or solitaire.

Rules

Klondike is played with a standard 52-card deck, without Jokers.

After shuffling, a tableau of seven fanned piles of cards is laid from left to right. From left to right, each pile contains one more card than the last. The first and left-most pile contains a single upturned card, the second pile contains two cards, the third pile contains three cards, the fourth pile contains four cards, the fifth pile contains five cards, the sixth pile contains six cards, and the seventh pile contains seven cards. The topmost card of each pile is turned face up.

The remaining cards form the stock and are placed facedown at the upper left of the layout.

The four foundations (light rectangles in the upper right of the figure) are built up by suit from Ace (low in this game) to King, and the tableau piles can be built down by alternate colors. Every face-up card in a partial pile, or a complete pile, can be moved, as a unit, to another tableau pile on the basis of its highest card. Any empty piles can be filled with a King, or a pile of cards with a King. The aim of the game is to build up four stacks of cards starting with Ace and ending with King, all of the same suit, on one of the four foundations, at which time the player would have won.
There are different ways of dealing the remainder of the deck from the stock to the waste, including the following:
* Turning three cards at once to the waste, with no limit on passes through the deck.
* Turning three cards at once to the waste, with three passes through the deck.
* Turning one card at a time to the waste, with three passes through the deck.
* Turning one card at a time to the waste with only a single pass through the deck, and playing it if possible.
* Turning one card at a time to the waste, with no limit on passes through the deck.

If the player can no longer make any meaningful moves, the game is considered lost. At this point, winning is impossible.

Probability of winning

The probability of being able to win a game of Klondike with best-possible play is not known, although ''Hoyle's Rules of Games'' suggests the chances of winning as being 1 in 30 games. The inability of theoreticians to precisely calculate these odds has been referred to by mathematician Persi Diaconis as "one of the embarrassments of applied probability".
The best information about the winnability of Klondike concerns a modified version of the game called "Thoughtful Solitaire" or "Thoughtful Klondike", in which the location of all 52 cards is known.
The probability of winning Thoughtful Klondike (with draw three rules) has been calculated as being approximately 82%, more precisely as having a confidence interval of 81.956% ± 0.096%. Thoughtful Klondike is not quite the same as simply playing with all cards face up, as this would allow an impossible movement of a pile if the top downturned card happened to be in sequence with the upturned card underneath it. Using physical cards, Thoughtful Klondike can be played by peeking at the face-down cards or by dealing the downturned cards face-up but sideways to differentiate them from the tableau piles. With electronic programs Thoughtful Klondike can be played by allowing unlimited use of undos to return to the start if a choice turns out to be unfavorable.

Because the only difference between the two games (regular and thoughtful) is the knowledge of card location, all thoughtful games with solutions will also have solutions in Klondike. Since any winnable Klondike game must necessarily be winnable when played thoughtfully, the results on Thoughtful Klondike tells us that 82% is an upper bound on the winnability of regular Klondike when we don't know the location of all cards. The true probability with best play might be much smaller, because the difference between a right and wrong move cannot be known in advance whenever more than one move is possible and some cards are still hidden. Ultimately, very little is known about the winnability of regular Klondike. A Klondike-playing AI using Monte Carlo tree search was able to solve up to 35% of randomly generated regular Klondike games, placing a lower bound on the winnability percentage. One experiment found a skilled player could win 189 out of 442 games (43%), but this gives a massive gap of almost 40% between that number and 82%.

Variants

Single deck

Below are some single-pack variants of Klondike:
* Agnes (US variant): the stock is dealt in batches of seven on reserve piles and every one is available. Furthermore, the bases of the foundations depends on the twenty-ninth card, which is dealt on the foundations.
* Easthaven (less commonly Aces Up,) twenty-one cards are dealt into seven piles of three, two face-down and one face-up. A space in this game may only be filled by a king or sequence starting with a king (several rule sets simplify this and allow any card or sequence to be moved to a vacancy), and when a play goes to a standstill, seven new cards are dealt to the tableau, one top of each pile. Easthaven may be played with 2 or 3 decks. The two-deck version is either called Double Easthaven or Gypsy.
* Nine Across: nine columns of cards are dealt, as opposed to seven in classic Klondike. The player can choose which cards to form the foundations; if one or more eights are exposed, for example, the player may decide to build on eights, and the piles are built up 8-9-10-J-Q-K-Ace-2-3-4-5-6-7. If eights are built on, sevens fill up spaces and so forth. The stock is dealt through one by one as many times as required.
* Somerset or Usk: as Klondike but all the cards are dealt out: 10 in the first row, 9 in the second, and so on until there are 3 in the last.
* Thumb and Pouch: a card in the tableau can be built upon another that is any suit other than its own (e.g. spades cannot be placed over spades) and spaces can be filled by any card or sequence.
* Whitehead: ''all'' cards are dealt face up, building is by color (red on red, black on black), a sequence made up of cards that are of the same suit can be moved as a unit, and a space can be filled by any card or sequence.
* Westcliff (US variant): thirty cards are dealt into ten piles of three cards, two face down and one face up. A space in this game can be filled with any card or sequence.
* Kuipers: as Klondike but with eight columns instead of seven, turning one card at a time to the waste, with no limit on passes through the deck. This lowers the probability of winning to approximately 5%.

Tarot deck

The game can be played with a Tarot-style 78-card deck (such as a Tarot Nouveau

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