Cheating

Cheating in poker is any behavior outside the rules that is intended to give an unfair advantage to one or more players.

Cheating can be done many ways, including collusion, sleight-of-hand (such as bottom dealing or stacking the deck), or the use of physical objects such as marked cards or holdout devices.

Cheating occurs in both friendly games and casinos. Cheats may operate alone, but also may operate in teams or small groups.

Following is a list of terms used to categorize specific card cheats:
 * card mechanic: A card cheat who specializes in sleight-of-hand manipulation of cards, a card sharp.
 * base dealer: Also called a bottom dealer, or a second dealer, this relies on two related methods that manipulate the dealing of cards.
 * paper player: A card cheat that exploits the use of marked cards.
 * hand mucker: A card cheat that specializes in switching cards.
 * machine player: A card cheat that uses mechanical holdouts.

Minimal-skill methods
The easiest and most common types of cheating require no ability of manipulation, but rather merely the nerve. Such methods include shorting the pot, avoiding house fees, and peeking at other players' cards. However, it is very difficult to prove because when confronted, at least the first time, the cheat often calls the cheating an honest mistake.

One minimal-skill method that occurs in non-casino games happens when a player who has folded appoints himself the tender of the pot, stacking chips, counting them, and delivering them to the winning player. Check-chopping is when such a "helpful" player palms a chip. Odorless adhesive can be used for this purpose.

Another minimal-skill method is going south (also known as "ratholing"), where a player covertly removes a portion of his chips from play while remaining in the game, normally in order to preserve the winnings as profit, or prevent a major loss in "big bet" games.

Skilled methods
A cheat may hand-muck, that is, switch their hand with one they have secretly hidden. This may also be done with a confederate.

A skilled cheat can deal the second card, the bottom card, the second from bottom card, and the middle card. The idea is to cull, or to find the cards one needs, place them at the bottom, top, or any other place the cheat wants, then false deal them to oneself or one's confederate.

One sign of false dealing could be when a dealer grips the deck with the index finger in front of it. This is referred to as the mechanic's grip. It not only allows better control of the cards, but provides cover as, showing the back of the top card, and without moving the hand holding the deck.

Even if a cheat deals himself a powerful hand, he may not win much money if every other player has nothing, so often the cheat will stack two hands, with one player getting a strong hand and the cheater getting an even stronger one. This is called a double duke.

One method of cheating that involves both great risk and great potential pay-off is the cold deck—so called because it has not been "warmed up" by play (and thus randomised). Such decks are usually pre-stacked, and are introduced either at the deal, after the real deck has been shuffled, or before the deal, where a card sharp will make a false shuffle using sleight of hand. The latter method may require collusion or a pass if the style of play or house rules call for a cut. The skill lies both in convincing other players that the shuffle is legitimate and in ensuring that other players receive hands that are good enough to entice them into play, but not too good to arouse suspicion.

Marked cards
Marked cards are printed or altered so that the cheater can know the value of specific cards while only looking at the back. Ways of marking are too numerous to mention, but there are certain broad types. A common way of marking cards involves marks on a round design on the card so as to be read like a clock (an ace is marked at one o'clock, and so on until the king, which is not marked). Shading a card by putting it in the sun or scratching the surface with a razor are ways to mark an already printed deck.

Juice and "daub" are two kinds of substances that can be used to mark cards in a subtle way so as to avoid detection, when done properly. While a "juice" deck is premarked and introduced into play by the cheater, "daub" is applied during play to any deck. Once trained, cheaters can read the cards from across the table.

Decks can be marked while playing using fingernails or by bending or crimping the cards in a position that the cheat can read from across the table. The practice of burning the top card, or cards, is to prevent a cheat from knowing that top card and dealing "seconds" to either give a confederate a card that helps his hand or an opponent a card that hurts his.

Collusion
Collusion is two or more players acting with a secret, common strategy. Some common forms of collusion are: soft play, that is, failing to bet or raise in a situation that would normally merit it, because you don't want to cost your partner money; whipsawing, where partners raise and reraise each other to trap players in between; dumping, where a cheater will deliberately lose to a partner; and signalling, or trading information between partners via signals of some sort, like arranging their chips in a certain manner.

Simple collusion in online poker is relatively easy and much more difficult to immediately spot if executed well. Cheaters can engage in telephone calls or instant messaging, discussing their cards, since nobody can see them. Sometimes one person be using two or more computers to play multiple hands at the same table under different aliases (since many broadband plans offer customers multiple IP addresses, this can conveniently and cheaply be done without the likelihood of immediate detection). Such tactics can give cheaters an advantage that is difficult to work against. However, online poker cardrooms keep records of every hand played, and collusion can often be detected by finding any of several detectable patterns (such as folding good hands to a small bet, as it is known that another player has a better hand). Users who frequently sit at the same tables will be flagged by poker rooms and their play will be closely monitored. Often, such users will be warned they have been flagged, in an effort to deter collusion.

In a poker tournament, when one player is all in and two other players are active in the pot, it is common for the two players with chips left to "check it down", or check on each round of betting through the end of the hand. Unless they explicitly communicate an agreement about checking it down, this is not collusion.

Online specific
Other than collusion, the methods detailed above are impossible in online poker since they entail the use and manipulation of physical cards, chips and objects, however some concerns are specific to online poker. One is the use of bots. These are programs that play instead of a real human. Though their accuracy and their ability to actually win are in dispute, their use normally violates the rules of online cardrooms, so using them is by definition cheating. .

In Fall 2007, a major employee cheating scandal occurred at Absolute Poker.

The user agreement of the two online poker sites owned by Tokwiro Enterprises, Absolute Poker and UltimateBet, state they reserve the right to cancel an account if a player plays "in a professional sense" (and not for personal entertainment only). However this is not a standard prohibition. For example, it is not in the end-user agreements of the three largest online cardrooms: PokerStars, PartyPoker, and Full Tilt Poker.

When two players are found to be swapping chips illegally, both players are kicked from the game and their chips are forfeited.

Angle shooting
Angle shooting is engaging in actions that may technically be within the scope of the rules of the game, but that are considered unethical or unfair to exploit or take advantage of another player. For example, an angle shooter might motion as if he were folding his hand to induce other players to fold theirs out of turn.

One form of angle shooting which is exclusive to online poker is to abuse the disconnect protection (DP) rules most sites have in place. DP is a rule exclusive to online poker whereby if a player is disconnected from the site in the middle of the hand his hand is played out as if he were all-in without the player actually having to put any more money in the pot. The online poker rooms that offer DP usually have specific tables set aside for this so that all players at the table are aware that the special DP rules will apply.

How this is used by angle shooters is if a player is in a hand that he is unsure if he has the best cards and doesn't want to invest any more money to find out. He can unplug his internet connection and then wait for the hand to play itself out. On a DP table the remaining cards in the hand would be dealt and the pot would be awarded to the player with the best cards. If there were multiple opponents in the hand then he would be eligible for a side pot.

A similar form of angle shooting which is mostly confined to the online game (although not theoretically impossible in live poker) is repeated short buying or short stacking. While ratholing in the traditional sense is impossible in an online game, behavior considered to be similar to ratholing is quite easy. Short buying at a table, winning and then cashing out only to short buy right back in again would generally be an impractial strategy in live games with long waiting lists, but the situation is different in online games where players sometimes have immediate access to a table. Although such behavior is not technically against the rules, it allegedly flouts the principles behind table stakes poker to the extent that some players consider it an ethically dubious variation on ratholing. Most sites try to reduce this strategy's effectiveness by imposing a waiting period during which a player wishing to rebuy at the same table must do so for no less than what he removed from the table (unless this exceeds the maximum buy-in in which case the player would be required to make the maximum buy-in). However, players can mitigate the effects of these restrictions to a considerable extent by joining many tables at the same time (which in itself is both acceptable and somewhat commonplace) or by establishing accounts on different sites and rotating play between them (note that while there is nothing unacceptable about someone playing in as many online poker rooms as he pleases, establishing multiple accounts on the same site violates virtually all online poker rooms' terms and conditions and is thus by definition cheating).

Cheating in poker in popular culture

 * The Cincinnati Kid
 * The Sting
 * Shade
 * Rounders
 * Tilt