The most common system, Hi-Lo, assigns
What Is Card Counting in Casino Blackjack?
Card counting is a strategy used by some blackjack players to track the ratio of high to low cards remaining in the shoe. When the count is positive, the player theoretically has a slight edge over the house. The technique is not illegal, but casinos can refuse service to suspected counters.
Modern multi-deck shoes and frequent shuffling have reduced the effectiveness of basic counting systems. Still, understanding the concept helps players grasp why casinos enforce table rules such as continuous shuffle machines and mid-shoe entry restrictions.
How Counting Works
values of +1 to cards 2–6, 0
The most common system, Hi-Lo, assigns values of +1 to cards 2–6, 0 to 7–9, and –1 to 10-Ace. Players keep a running count and convert it into a “true count” by dividing by the number of decks left. Bets are increased when the true count is +2 or higher.
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Casino Countermeasures
Dealers may shuffle after every hand
if the count becomes heavily positive. Table
Dealers may shuffle after every hand if the count becomes heavily positive. Table minimums can rise without notice. Some properties use facial-recognition software to identify known counters across multiple visits. Players who spread bets too aggressively are most likely to attract attention.
Legal and Ethical Considerations
Card counting is a mental exercise
that uses publicly available information. No law
Card counting is a mental exercise that uses publicly available information. No law in the United States prohibits it, but private businesses retain the right to refuse service. Players who attempt to hide their actions with electronic devices can face criminal charges for cheating.