eli5 how do casinos determine if someone is counting cards?
In: 59
The way you make your money with counting is by increasing your bets with positive counts (among other things but that’s the primary factor). If the casino sees you have a high bet spread, if you always bet the minimum at the start of a shoe, they can review the video and see if it correlates with the count. Then they have you.
There are some other tells such as playing deviations like splitting tens but these happen relatively infrequently.
As others have said though they don’t need proof to ban you.
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