eli5 how do casinos determine if someone is counting cards?
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The “trick” to counting cards and making money is to vary the bets according to the state of the deck (number of 10-K vs others). Although the casino cannot PROVE it, they don’t have to. They can throw anyone out just on suspicion. As long as there is a somewhat clear and long running winning streak and the player varies their bets from game to game, it can be spotted.
Most blackjack players play with fairly constant stakes, so betting $100 one round, the upping to to $500 a few rounds later only to reduce it to $10 when the deck is shuffled can be a rather obvious sign.
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