Knight or Cavalier (Chevalier) ranks between the Jack and the Queen. Klondike Tarot Evens: use six foundations; the usual four, and then use the red knights (cavaliers) as the royals for trumps 1–10, and the black knights as the royals for trumps 11–21. Gambling variant In some casinos, Klondike is turned into a gambling game, by playing with the rule of dealing cards one at a time and going through the stock once. For example, a player would pay $50 to play, and the house would pay $5 for each card played to the foundations. This form of Klondike is sometimes called Las Vegas Solitaire. Joker Solitaire Joker Solitaire is a variant of Klondike created by Joli Quentin Kansil which adds two jokers that serve as limited wild cards. This adds more skill because players are required to make many calculated decisions. Double Solitaire Klondike has been turned into a two player game under the name Double Solitaire. Players have their own packs and may not play to each other's tableaus, but share their foundations. Players take turns until they are unable to play a card from their talons. The first player to play all 52 cards is the winner. Informally, "Double" Solitaire can be played as a party game with more than 2 players. Computerized versions Digital versions of Klondike have helped popularize the game and offer advantages over playing with a physical deck. Notable examples of computerized versions include: A software version of Klondike named simply "Solitaire" has been a regular inclusion in the Microsoft Windows operating system, beginning from Windows 3.0 in 1990. Initially Microsoft included the game as both a diversion and a teaching tool: for many users, Solitaire was their first introduction to using a computer mouse. Microsoft officials stated in 1994 that "for years, Solitaire was the most-used application for Windows". The Atari Program Exchange published Mark Reid's implementation of Klondike for the Atari 8-bit family, simply titled Solitaire, in 1981. Michael A. Casteel's shareware version of Klondike for the Macintosh was first released in 1984, and has been continually updated since. Klondike was added to Clubhouse Games: 51 Worldwide Classics for Nintendo Switch, a compilation of tabletop games. Scoring in the Microsoft Windows Solitaire version of Klondike is as follows: Moving cards directly from the Waste stack to a Foundation scores 10 points. However, if the card is first moved to a Tableau,