The Wong Halves System for Card Counting

Basics of the Wong Halves System

The Wong Halves System is a standard, balanced card-counting system for blackjack. It allows players to track the ratio of high to low cards in the shoe and recognize when they have the advantage. Decks rich in high cards, such as Aces and 10-value cards, are more favorable to players, whereas decks with fewer high cards favor the house. The Wong Halves System is a rather complicated level-3 method that assigns positive, negative, or neutral numerical values to the cards.

This system also uses fractions, making it significantly harder to apply than most methods. Here are the numerical values used in the Wong Halves count:

• 2, 7: +0.5
• 3, 4, 6: +1
• 5: +1.5
• 8: 0
• 9: -0.5
• 10, J, Q, K, A: -1

As shown above, the highest value is assigned to the 5s (+1.5). Mathematical analysis has shown that these cards are the least favorable for the player. In contrast, the high cards that help form hands of 20 or 21, including blackjack, are worth -1. The method also assumes that the 9s in the deck shift the odds slightly in the player’s favor, which is why they are also assigned a negative value (-0.5).

The sum of all card values in a deck is exactly 0, making the Wong Halves System balanced. This means that before adjusting their bets, players need to convert the running count into a true count. This process is explained below.

How to Use the Wong Halves System?

Before counting cards, players should determine their bankroll and the minimum and maximum bets they are comfortable making. A good betting spread for beginners is 1-5, while larger spreads, such as 1-10 or 1-20, may offer greater profit potential but also carry greater risk. After a reshuffle, players begin the game with 1-unit bets. They start the count at 0 and add or subtract values as cards appear on the table.

Because this system is more complicated than many others, let’s use a 6-deck game as an example. The first cards dealt are 7, 2, Queen, 4, and 8, corresponding to +0.5, +0.5, -1, +1, and 0, respectively. This produces a running count of +1, indicating that the player has a slight advantage over the house. However, these are only the first five of the 312 cards in the six decks used in this game.

Additional negative-value cards could quickly push the count below 0. The uncertainty created by the many cards still remaining in the shoe makes the running count of +1 largely irrelevant. To provide a more accurate assessment, the system requires converting the running count to the “true count”.

True Count

Unlike the running count, which players maintain continuously during the game, the true count accounts for the number of decks remaining in the shoe. There are several ways to determine the true count, but most players use a simple, proven method: they divide the running count by the number of decks in the shoe.

Continuing with the same example, the running count is +1. Assuming some cards have been burned and dealt, suppose about five decks remain in the shoe. Dividing 1 by 5 produces a true count of +0.20.

Because higher counts indicate better odds for the player, this true count is not impressive. In fact, players need a minimum true count of +2 to gain an actual advantage over the house. They therefore continue placing the minimum wager until the count reaches +2 or higher. At that point, they increase the bet size to maximize the potential profit from the favorable situation. The higher the count, the larger the bets should be. Players should bet less when the count is low.