There are any number of blackjack card counting systems out there, ranging from complex to simple. Obviously if you have decided to begin learning card counting it makes sense to start with an easy system. Then, once you have become skilled at using that system, learn a newer more complex one if you would like.
The easiest blackjack card counting system is also one of the most common. It is called the Hi Lo system, and it is the one that the majority of beginning counters start with. It is a basic counting system whose only demand on your math skills is to add and subtract a positive one and a negative one.
Almost all of the cards have a positive or negative counting value assigned to them. The only cards that do not are 7, 8 and 9. Those three are considered neutral and have no value in this counting system. The other cards are assigned like so:
2, 3, 4, 5, 6 are all +1
10, J, Q, K, Ace are all -1
The way this system works is that the player will add up the values of the cards that are on the table, including the dealer’s face up and hole card.
So say that you are playing with one other person. You have a 5/6 and you double for 9. The other player has 2/6/5 and stands. The dealer has a 10 with a hole card of 6 and hits for 7 and busts. Adding up the value of cards played, starting with your hand and ending with the dealer, would look like this:
1 + 1 + 0 + 1 + 1 + 1 + -1 + 1 + 0 = 5
Your count ends with a positive number. This means that more low cards were played than high cards, and so the remaining deck is richer in high cards.
You keep adding to you count with the next round. In the case of our example you pick up with 5 at the beginning of the next round.
A positive count means the remaining deck is rich in high cards, while a negative count means that more high cards have been played leaving the remainder of the deck rich with low cards. Blackjack card counters will raise their wagers with a positive count, and lower them with a negative count.
As the simplest blackjack card counting system, it is easy to see why so many beginning blackjack card counters start with this system.