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Many packs of cards produced by manufacturers have unintentional, almost indistinguishable edge irregularities. Typically the backs of every card in such a pack are identical, but the two long edges of each card are distinguishable from one another: the back pattern of one card is not symmetrical to another that has been rotated 180° (half a full turn).
During the course of a game, the player asks the dealer to rotate high-value face-up cards, saying for example that they feel it will bring them luck. The dealer, indulging superstition, does not realize he or she is unwittingly orienting the cards such that valuable high cards are oriented one way in the deck and low cards the other way round. The unintentional card edge irregularity thus makes the high or low value of face-down cards apparent to an observer aware of how the dealer has been tricked into orienting them. This orientation will remain so long as the cards are not "washed
Over the course of a game being played this way, low cards will tend to be oriented one way, high cards the other. Once a significant proportion of cards have been rotated, any player who knows this 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
==Legality==
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