The shuffling is still random so it is not a cheat for casino if they need to defend themselves. If the pass parameter is set to zero, then the ASM acts like hand shuffle. But say the pit boss sets the parameter to 3, then a desired card is always push through from the left chamber to the right chamber. An undesired card (card not belong to the group) is pushed back in the first three tries but is pushed through on the fourth scan nonetheless. The end product is a shoe that is very unfriendly to Basic Strategy players if the pass parameter is set very high due to grouping or clumping.
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