Players are at a disadvantage when new playing cards are brought into a blackjack game. This is because new cards come in a predetermined order directly from the card manufacturer. The decks are usually arranged ace through king, king through ace and so on.
When the cards are first introduced, even after being shuffled, they will have a tendency to clump up with 10s in one part of the deck and low cards in another part. As the deck is shuffled after each round, the cards will then spread out into a normal random fashion.
A study was done some years ago that found that a single deck had to be shuffled at least seven times before it became fully random. It's suggested you wait at least 10 minutes in a single-deck game and about 30 minutes against the shoe before playing with new cards at blackjack.
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