The "10-count" system is a card counting strategy used in blackjack to help players gain an advantage over the house. This system involves keeping track of high and low-value cards that have been dealt, with a specific focus on counting tens and face cards. Players assign a value to each card as it is revealed, enabling them to estimate the ratio of high cards to low cards remaining in the deck. The idea is that when there are more high cards left, the player has a better chance of hitting a blackjack or a strong hand, prompting them to increase their bets accordingly.