One of the easiest ways to cheat at poker is with a partner or many partners, called collusion. This is basically playing differently against one or more players than you do against others at the table (in contrast to mechanics, which is directly manipulating cards or chips in violation of the rules). The gravity of such cheating ranges from the subconscious to the conspiratorial. Some common forms of collusion are soft play, that is, failing to bet or raise in a situation that would normally merit it because of your opponent; whipsawing, where partners at opposite ends of the table raise and reraise each other to trap players in between; and dumping, or deliberately losing to a partner (perhaps someone you are backing financially or with whom you have traded a percentage stake). Signalling (that is, trading information between partners) is probably the most egregious example of such cheating, but all of these are considered bad play and should not be tolerated at any poker game.

In friendly games it is common to be playing against someone you know well. Perhaps your spouse may be playing at the game with the rest of your friends. Suddenly your luck turns for the worse. Subconsciously, you are less willing to take the money of the people you know or love. Perhaps one fellow has been getting bad hands all evening, and you know he has car payments to make, and this changes the game being played. The best advice is to leave friendship outside the poker game. Especially in tournament poker, soft-playing a friend is cheating all of the other players out of their chance to see you bust your friend, getting them closer to the prize money.

For this reason, there are laws in some U.S. states saying that a husband and wife cannot play poker at the same table. Perhaps the easiest way to exploit such a situation is to agree to split the profits (after all, couples often have shared bank accounts). Even without any explicit collusion during the game, this reduces the variance of the team as a whole.

It should come as no surprise that two people sharing information about their hands enjoy a great advantage over the other players. If you do not believe this, deal out a few poker hands, but deal yourself two. The idea is that these players signal one another and only play the better of the two hands. Signals can take many forms, from the placement of the chips on the cards to morse code tappings on the table. The key ingredient in all signaling systems is the ability to be repeated unobtrusively. In order for this advantage to make money it has to be done many times without someone realizing it. In a game where people (hopefully) are always watching each other, this can prove problematic. When a cheat is signaling the value of his hand to his partner, he is also signaling the value of his hand to everyone at the table. The result of a system of signals being figured out is nothing short of financial disaster. Some games are more susceptible to this kind of cheating than others: in Five-card stud and Lowball, for example, signalling the rank of just one card can give another player sufficient information to make many otherwise difficult decisions.

Collusion in online poker is relatively easy and much more difficult to spot if executed well. The main reason is that the cheaters can engage in instant messaging discussing their cards with no one looking at them. Sometimes the same person can be using two or more computers and playing under different aliases. This gives him an advantage that’s difficult to work against. However many poker rooms have imposed a maximum of one account per household, though a determined cheater can still bypass this by using multiple connections thus having different IP addresses. However, online poker sites keep records of every hand played, and collusion can often be detected by finding the appropriate pattern. Many sites also offer head-to-head (heads-up) games, where collusion is not useful.

Another concern in online poker is the use of software called “bots” (short for computer robots). These are programs that make decisions on behalf of the player based on odds etc. and also play on their behalf. Though their accuracy and ability has been questioned, it has nevertheless been seen as unfair practices by the poker room and has sought to ban them. With improvements in software and hardware it is expected that in the near future a bot that can beat a human consistently is a near certainity.

Should two people wanting to cheat be in close proximity, they might decide to hand-muck. That is, to switch hands or alter them in some way (though this particular form of cheating might be considered mechanics rather than collusion). A simple idea of this is to have two people sitting next to each other in a game of draw poker. While they receive two mediocre hands, they could switch certain cards between themselves in order to form a worthless hand and a winner. There are many sleight of hand methods to this. Hand-mucking is also a problem in blackjack.

Perhaps the most odious way of cheating with a partner is to have a weekly game at your house, agreeing with all your regular players that you split the profit from cheating a single player. This hot-seat game invites a new player every week, only to play against six players all working together. The mechanics are the same, players signal their hands, then play proceeds as to drive the hot-seat out, or to put all his money in the pot.

If you are at a poker game and you detect that your opponents are cheating, but are not very good at it, you can use this information to your advantage. You may be better off exploiting their inept cheating than leaving or turning them in. Dr. Frank R. Wallace wrote a book on this, in which he coined the term neocheating (He later developed a philosophy called Neo-Tech. The book consists of 2 parts easy to spot cheating techniques (marking the deck, crimping cards, false cuts, etc) and 5 parts philosophical content and stories.

This guide is licensed under the GNU Free Documentation License. It uses material from the Wikipedia.

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