The Hi-Lo card counting system is a method used in blackjack to track the ratio of high to low cards remaining in the deck. Cards are assigned values—low cards (2-6) are worth +1, high cards (10, Jack, Queen, King, Ace) are worth -1, and neutral cards (7-9) have no value. Players keep a "running count" as cards are dealt, adjusting it based on the values of the cards shown. To improve accuracy, the running count is often converted into a "true count" by dividing it by the number of decks remaining. When the true count is high, indicating more high cards are left, players increase their bets, as high cards favor them. Conversely, they bet less when the count is low. This system helps players gain an edge over the casino by making more informed betting decisions based on the deck's composition.