## Blackjack high-low method (High-Low) card counting method

Assuming that the probability of 52 cards appearing is always the same, that is to say, each card is drawn from an infinite number of decks of cards, or that the cards that have been played before do not affect the cards that follow. In other words, Each card is independent of each other.

1. ” High-Low ” card counting method

What is popular now is a card counting method called “High-Low”. During the game, we count each occurrence of 2, 3, 4, 5, 6 as +1 point, 7, 8, 9 as 0 point, 10, J, Q, K, A as -1 point, and The points are added together, and the larger the result is, the more small cards that have appeared before, the more beneficial to the player. Conversely, if the result is a negative number, it means that there have been more big cards than small cards, which is beneficial to the dealer.

In practical applications, you can also use the technique of counting two cards, because the dealer usually deals more quickly, so that you can easily offset many large and small cards that appear at the same time, which improves the card counting speed and reduces forbesblog.org Possible calculation error. For example, in the above example, if two cards are counted, they are: 1, 1, -1, -2, -2, -2, -3.

If it is a deck of cards, -3 is already a very bad point, and you should place the minimum bet or stop playing. But generally speaking, current casinos use six to eight decks of cards, so out of the six decks of 312 cards, 14 cards are dealt, and there are 298 cards left. The average number of cards per deck is (-3)× 52/298 = -0.5, which is quite tolerable.

1. How to adjust the bet

When the points become larger, how to increase the bet, each poker counter has its own habits and calculations. JL Kelly of Bell Labs deduced that, in theory, if you have the advantage of A and the total capital is R, then the optimal bet is B = A * R. For example, if you have a capital of 10,000 yuan, and now you have a 1% advantage, then you should hold down a hundred yuan here. This kind of betting method is called Kelly method, which is the method that can get the maximum return in theory.