It is considered that if the shoe is rich in ten value cards, players have a better chance of winning and therefore, should place their bets accordingly.
It simply provides information whether there are more power cards or weak ones remaining. The running count is used to help players predict more accurately whether the upcoming cards in the deck will be favourable or unfavourable. For instance, if players calculate that the running count is plus 5, this indicates that the deck has five more high value cards left. It is estimated according to the assigned values for each card which can be positive, negative or zero, depending on the chosen system. The running count is the count which players apply in order to determine the true count by counting the cards during the course of the game, using a particular card counting system.