Top poker player Phil Ivey has lost a case to reclaim £7.7m in winnings from a London casino.
The case centred on the technique of 'edge-sorting' which Mr Ivey had used to help him in the game.
The player insisted it was a "legitimate strategy" to exploit the casino's failure to protect themselves against top players such as himself.
Essentially the technique involves working out the value of a card by spotting small differences in the patterns on the back of the card.
Casino security expert Willy Allison explains how edge-sorting works to give players an advantage against the house.
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