There are more advanced systems for blackjack than a simple HI-LO counting .. some are extremely elaborate .. I won’t touch on those today .. but the next step up involves assigning different values to cards, as follows:
2, 3, 6, 7 all have a value of +1
4, 5 have a value of +2
10 ,J, Q, K all have a value of -2
that leaves 8, 9 and A all having a value of 0
Although an ace has no value it is important to keep a separate count of Aces.
If strictly adhered to and kept accurate , this system can prove very effective in giving a slight edge to the player. It is also worth bearing in mind that this edge diminishes with the amount of decks in play due to the lesser variations you will get. So adjusting your count accordingly is advisable. A good rule of thumb is to add a point for every 2 decks. So if you have 4 decks , you will start the count on +2 .. if you have 6 decks, then +3 , and so on. Also remember that a high count late into the shoe is a lot more powerful than near the start.