No 1 in Gambling

The Griffin Book is a listing of known or suspected gambling cheaters and advantage players published by Griffin Investigations, a firm that monitors casinos. Those listed may be anyone perceived as a threat to the casino's profits, including card counters, people who mark cards and those who try to cheat slot machines. The book keeps pictures either obtained from a photo of the individual when caught or from surveillance photos.

"Black Book" is the nickname frequently used to refer to a list of persons who are unwelcome in casinos. The name comes from the fact that the persons listed in the "book" are essentially "blacklisted". The term can refer either to such a list officially maintained by a particular Gaming Control Board, or to the Griffin Book, whose information is shared by casinos throughout the gaming industry.

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Advantage player is a term used to describe a person who has the ability to play a casino gambling game so skillfully that even without cheating, that person can negate or reverse the casino's typical built-in house advantage in that game. Examples of advantage play include card counting in blackjack and dice control in craps.

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