eli5 how do casinos determine if someone is counting cards?
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With the main method of counting cards, you keep a tally of high cards vs low cards. You call this tally the ‘count’.
To get advantage from counting cards, you want to play when the ‘count’ is high. You also want to bet bigger the higher the count is.
Ideally, you would stand back and watch (and not play) until the count is high and it gives you an advantage, and only sit down to play then.
However, if you stand there staring at the blackjack table and then suddenly sit down and bet big, only to stand up later, you will look suspicious. It will look exactly like the most obvious card-counting ever.
To slightly disguise your card-counting a bit, you can play (at a slight disadvantage) on the minimum bet, and then increase the bet when the count is high. This is less advantageous, but the casino needs to pay more attention to spot that you are getting an advantage.
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