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Pop culture has created a massive myth around the practice of counting cards at the blackjack table.

The reality of this famous blackjack strategy is far less glamorous and requires intense, grueling mental discipline.

Is Card Counting Actually Illegal?

You cannot be criminally charged simply for being good at math and paying attention to the game.

However, while it isn't illegal, casinos are private businesses and they strongly detest advantage players.

• Using a physical device or a smartphone app to count cards is strictly illegal and will lead to arrest
• Casinos share databases of known counters, meaning getting banned at one property might get you banned everywhere
• Security teams use advanced software to analyze betting patterns to catch suspected counters

The Mechanics of the Hi-Lo Count

The most common system, the Hi-Lo, does not require photographic memory, just basic addition and subtraction.

When many low cards are dealt, the 'running count' goes up, indicating the deck is now rich in high cards.

Ultimately, a perfect card counter only has about a 1% to 1.5% mathematical advantage over the house.