The shell game (also known as Thimblerig, Three shells and a pea, the old army game) is portrayed as a gambling game, but …

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The shell game is portrayed as a gambling game, but in reality, it is an illegal confidence trick used to perpetrate fraud. In confidence trick slang, this famous swindle is referred to as a short-con because it is quick and easy to pull off.

The game requires three shells (walnut shells, bottle caps, and even match boxes have been used), and a small, soft round ball, about the size of a pea, and often referred to as such. It can be played on almost any flat surface, but on the streets it is often seen played on a mat lying on the ground, or on a cardboard box. The person perpetrating the swindle (called the shell man) begins the game by placing the pea under one of the shells, then quickly shuffles the shells around. Once done shuffling, the operator takes bets from his audience on the location of the pea. The audience is told that if a player bets and guesses correctly, the player will win back double his bet (that is, he will double his money); otherwise they lose the money. However, in the hands of a skilled operator, it is not possible for the game to be won, unless the operator wants the player to win.

When an individual not familiar with the shell game encounters a game on the streets, it appears that bets are being placed by numerous players, when in reality; most of the persons standing around a game are in league with the operator in a confidence ring. Shell game gangs generally prefer to swindle one “player”/victim, or mark, at a time. The apparent players actually serve various roles in the swindle: they act as lookouts for the police; they also serve as “muscle” to intimidate marks who become unruly and some are shills, whose job is to pretend to play the game, and entice the mark into betting. Once a mark enters the circle of apparent players and faces the operator, the gang surrounds them to discourage an easy exit and to keep other pedestrians from entering and disrupting the confidence trick gang’s action on the main mark. The job of crowding around also protects the operator from any incriminating photographs being taken of the act. The operator and the shills will try to get the mark into a heightened state of anger or greed. Once this is accomplished, one shill will pretend to disclose a winning strategy to the mark. It is all a ruse to get the mark to place a large bet.

The operator’s trick is sleight of hand. A skilled operator can remove a pea from under any shell (or shells) and place it (or not) under any shell (or shells) undetected by a mark. So it is never of any benefit for the mark to watch the movement of either the shells or the operator’s hands.

When the operator has finished moving the shells around, he asks the mark if they wish to bet on the play. If a mark agrees, they have to place their money down before they can point to a shell. Using sleight of hand, the pea is revealed to be under a different shell than chosen.

If no mark wants to play, one of the shills may start the play in order to animate the mark. The shill will either lift a shell which is “obviously” wrong and will lose his money, or he lifts the “obvious” shell and wins. Or he may pretend that he has discovered some trick, and either “succeed” or clumsily fail.

The game should not be mistaken for an honest game. It is not possible for a mark to win, even if they know how the trick is worked, or even if they “accidentally” pick the shell that actually has the pea under it. Through very skilled sleight of hand, the operator can easily hide the pea, without the mark seeing. Any player who is suspected of understanding the trick, or does not place a bet and just wants to watch, will be quickly edged away from the table by the shills or the muscle. The shell game set-up and lay-out is quick and simple, so that in the event of trouble, or if they are signaled that authorities are approaching, they can remove all traces of the game in seconds.