In blackjack, the running count is a key component of card counting, helping players gauge the composition of the remaining deck. To use a running count, you assign values to cards: low cards (2-6) are +1, high cards (10s, face cards, and Aces) are -1, and neutral cards (7-9) are 0. As cards are dealt, you mentally track the total of these values. A positive running count suggests the deck has more high cards remaining, which is favorable for the player, while a negative count indicates a deck rich in low cards, which favors the dealer. When the running count is high, you increase your bets, and when it’s low, you reduce your bets. In multiple-deck games, calculating the "true count" (by dividing the running count by the number of decks remaining) gives a more accurate sense of the deck's composition. Successful use of the running count requires practice and discretion, as casinos may monitor for card counters.