### Getting Started With 21-Point Card Counting

It turns out that according to mathematical statistics, when there are more big cards left in the card box, if the dealer’s points are between 12 and 16, the cards will easily burst, and the gambler will win on average. Blackjack investors use the “card counting method” to find investment opportunities with more big names. After a period of the card game, the combination of the cards in the deck is no longer a standard deck. For example, ten points may account for 5/13 instead of 4/13 (if the small card is played first).

Because the banker wins the gambler because the gambler explodes first, when there are relatively many big cards in the card box, the gambler can leave the brakes. The banker must have 17 points. If there are more big cards, the banker is easy to burst and the gambler’s winning rate increases.

Around 1960, Dr. Thorpe, a professor at the University of California, used computers to study the changes in the winning rate of gamblers under non-standard cards (such as the absence of five points or ten points in the card). He found that the gambler’s win rate will increase when the big cards (nine, ten, ace) are relatively long. Otherwise, the gambler’s loss rate will increase. Gamblers playing blackjack with a deck of cards follow the basic strategy to tie evenly with the dealer. If there are no five points in the card (only 48 cards), the gambler who plays the basic strategy wins an average of 3.6% from the dealer!

In 1963, Dr. Thorpe published the book “Beat the Dealer”, instructing gamblers to win blackjack by counting cards, and since then opened the war between card counters and casinos.

Dr. Thorpe’s “card counting method” is quite complicated. Countless scholars have followed in his footsteps and developed many accurate and simple card counting methods with more advanced computers. And now this article introduces the card counting method used by most card counters at present.

Hi-Lo card counting method divides thirteen cards into three groups. High cards (Hi)-ten, J, Q, K and A, neutral cards-seven, eight, nine, and low cards (Lo)-two to six. The parameter of the high card is minus one (-1), the low card is plus one (+1), and the neutral card is 0. Since a deck of cards (or multiple decks of cards) has the same number of high and low cards (20 cards each), the card counter starts counting from scratch and sees that the low cards increase by one and the high cards decrease by one. A deck or box of cards should be counted from zero to zero. Among them, it may have been counted to +10 (small cards first) or -18 (big cards first).

When you have a winning percentage, the more you play, the more you win , but even the best dealers may take blackjack, three sevens, or cheat. The statistician Kelly (Kelly) research found that betting with the same ratio of the existing betting cost according to the advantage ratio can achieve the highest logarithmic growth of the betting cost without risk. But if your bet amount is not adjusted with the decrease in the bet cost, you can consider placing half or quarter Kelly to reduce the risk. “Kelly” becomes a betting unit here, and the winning rate is 1%. When you bet one percent of the bet, it is called betting one Kelly.