We've all seen the movies where the fortunes of the characters are suddenly turned around with the discovery that one of them has the ability to count cards. In a matter of hours they win a huge amount and break the bank. Unfortunately, this is just the fiction of Hollywood. And though it's true that back in the day, real gamblers could make a decent living counting cards, those days are now long gone. Today you have to contend with sophisticated casino security. And nothing gets past them.
Thanks to Hollywood, everyone has an idea about counting cards at the casino. It's a technique in blackjack that can bring the odds into your favor by a tiny percentage. But enough to make a difference over the long term. The payer needs to keep a real and a running count in his head at the same time. From this, he'll know the type of cards left in the deck. Though counting cards is not illegal, and you'll not get arrested, as you can imagine, the casinos are not enamored with card counters.