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'''Edge sorting''' is a technique used in [[advantage gambling]] where a player determines whether a face-down [[playing card]] is likely to be low or high at [[casino]] table games by observing and exploiting subtle unintentional differences on the backs of some types of card.<ref>{{cite web|url=http://www.ibtimes.com/what-edge-sorting-phil-ivey-sued-borgata-casino-allegedly-cheated-win-96-million-baccarat-1571442 |title=What Is Edge Sorting? Phil Ivey Sued By Borgata Casino, Allegedly Cheated To Win $9.6 Million In Baccarat |publisher=[[International Business Times]] |author=Thomas Barrabi |date=2014-04-14 |accessdate=2014-04-19}}</ref> Some packs of cards produced by some manufacturers have an unintentional regularity. Typically all the cards in such a pack have long edges which are systematically distinguishable, they are not totally symmetric. During the course of a game, a player will ask the [[Croupier|dealer]], a casino employee, to rotate cards one way if are shown to be, typically, 6, 7, 8, or 9 (low), and the other way if high, perhaps saying they feel it will bring them luck. The dealer is also asked to shuffle the cards with an automatic shuffler, which does not change the orientation. The dealer is not obliged to comply, but will usually do so if the request is thought to be due to gamblers' superstition or mistrust. Over the course of a game, low cards will tend to be oriented one way, high cards the other.<ref>{{cite web|url=http://www.dailymail.co.uk/news/article-2420796/I-read-cards-Im-cheat-U-S-poker-ace-suing-Britains-oldest-casino-denied-8million-win-admits-using-controversial-edge-sorting-technique.html |title='I read the cards but I'm no cheat': U.S. poker ace suing Britain's oldest casino after being denied £8million win admits using controversial 'edge sorting' technique |publisher=[[Daily Mail]] |author=Ian Gallagher |date=2013-09-14 |accessdate=2014-04-19}}</ref> Once a significant proportion of cards have been rotated, players can gain a statistical edge more than outweighing [[house edge]] by using the knowledge whether the card to be turned is likely to be low or high.<ref name=PAMAG>{{cite web|url=http://www.phillymag.com/news/2014/04/14/borgata-poker-star-phil-ivey-cheated-edge-sorting/ |title=Borgata: Poker Star Phil Ivey Cheated Us Out of $10 Million Using Edge Sorting |publisher=Philly Mag |author=Victor Fiorillo |date=2014-04-14 |accessdate=2014-04-19}}</ref>
Casinos usually regard this technique as cheating; many players say that they are legitimately playing to gain an advantage. A UK High Court judgement ruled that the technique, which requires the player to trick the croupier into rotating cards, is cheating in civil law, and that a casino was justified in refusing payment of winnings; this ruling would not be applicable if the player simply took advantage of an observed error or anomaly for which he was not responsible in, say, the backs of the cards.
==Incidents==
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