The Joker’s use is greatly varied. Many card games omit the card from use entirely; due to this fact, Jokers are often simply used informally as replacements for lost cards in a deck by writing the lost card’s value on the joker. Other games, such as a 25-card variant of Euchre, make it one of the most important in the game. Often, the joker is a wildcard, and thereby allowed to represent other existing cards. The term “Joker’s Wild” originates from this practice, as does the game show of the same name.
The Joker can be an extremely beneficial, or an extremely harmful, card. In Euchre it is often used to represent Benny, the highest trump. In poker, it is wild. However, in the children’s game named Old Maid, a solitary joker represents the Maid, a card that is to be avoided.


The fundamental theorem of poker, introduced by David Sklansky, states that: every time you play your hand the way you would if you could see your opponent’s cards, you gain, and every time your opponent plays his cards differently from the way he would play them if he could see your cards, you gain.[1] This theorem is the foundation for many poker strategy topics. For example, bluffing and slow-playing (explained below) are examples of using deception to induce your opponents to play differently than they would if they could see your cards. There are some exceptions to the fundamental theorem in certain multi-way pot situations, as described in Morton’s theorem.
When playing short-handed (at a table with fewer players than normal), players must loosen up their play (play more hands) for several reasons:[1] There is less likelihood of another player having a strong hand because there are fewer players. Each player’s share of the forced bets increases because there are fewer players contributing to the forced bets, thus waiting for premium hands becomes more expensive. This type of situation comes up most often in tournament style play. In a cash game, the adjustments are very similar, but not quite as drastic as the table can ask for what is known as a ‘rake break.’ A rake break occurs when the floor-man, who represents the casino, agrees to take a smaller portion than usual for the hand. For example a random casino might normally receive 10% of the pot up to 5 dollars for a ‘rake.’ In this case the table would only owe 10% up to 3 dollars until there are a sufficient number of players again. In online poker rake breaks are determined automatically.