How do casino dealers know when somebody is counting cards?
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Dealers often don’t. That’s not their job. Security watches overhead. They watch for people who don’t seem to have the right run of luck. Sure you can win a lot. But if you never lose, that’s suspicious. The odds are in favor of the house.
They are also on the lookout for teams. Like the MIT team that was counting cards used a member at the table betting low and only playing in the barest sense. Then when the odds were good for a player, they signaled their partner to come play big. Security is on the look out for people who aren’t doing normal things, like just barely playing. Or being around the same people, especially if they act like they don’t know each other.
Counting cards, as an individual, with no devices, is technically not illegal. But it is much harder to count the cards just in your head, without another person, and maintain a cash flow that lets you stick it out for the big hands.
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