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In poker, a tell is a detectable change in a player's behavior
that gives clues to that player's hand.
Possible tells include leaning forward or back, placing chips with more
or less force, fidgeting, changes in breathing or tone of voice, direction
of gaze and actions with the cards, cigarettes, or drinks.
For example, a player with a weak hand, hoping to bluff, may throw his chips
into the pot forcefully and with a direct gaze at a player he hopes to
discourage from calling.
Tells may be common to a class of players or unique to a single player.
A player gains an advantage if she observes another player's tell,
particularly if that action is unconscious and reliable.
However, better players may fake tells, hoping to lead their opponents into
costly traps when they rely on the false information.
So the observing, creating, and evaluating of tells can add another level
to the play of poker.
Mike Caro has published the most comprehensive information on tells;
his Book of Tells (ISBN 0897461002) is now a standard reference on the subject.
David Mamet's 1987 movie House of Games includes an interesting
discussion and visual reference to tells as an essential part of the plot.
The 1998 movie Rounders contains an even more subtle use of strategy:
at one point, "Mike" discovers a tell in his opponent (that he eats
cookies in a particular way after he has bet a very strong hand), and
after using it once, he reveals to the opponent that he has this tell;
although this eliminates the usefulness of the tell itself, it upsets
his opponent so much that it affects his later play.
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