The KO (Knock-Out) card counting system is a simplified, unbalanced method for tracking the ratio of high to low cards remaining in the deck. Players assign values to cards—+1 for low cards (2-7), 0 for neutral cards (8-9), and -1 for high cards (10, J, Q, K, A). As cards are dealt, the player keeps a running count based on these values. A positive count suggests more low cards have been dealt, which benefits the player, while a negative count indicates the deck is favorable to the dealer. The KO system doesn’t require adjusting for the number of decks left, making it easier to use, though it can result in a less precise count than more complex systems. With practice, it provides an edge by helping players adjust their bets and decisions based on the remaining deck.