There has already been one row at this year's World Series of Poker, as the playing cards chosen for the six-and-a-half week poker marathon have been criticised by players, and been withdrawn from play.

Players were disappointed with the new style cards introduced by Harrah’s and the United States Playing Card Company, known as ‘Poker Peek’.

Complaints were rife, and mostly focused on the fact that the nines and sixes were difficult to tell apart, and the digits too small.

Within three hours of play the cards were changed to the more traditional Kem cards used throughout Las Vegas.