The "high-lows" variation in blackjack typically refers to the Hi-Lo card counting system, where cards are assigned values to help players track the composition of the deck. Low cards (2-6) are given a +1 value, high cards (10, Jack, Queen, King, Ace) are given a -1 value, and neutral cards (7-9) are valued at 0. By keeping a running count, players adjust their bets and strategy based on whether the deck is rich in high or low cards. A positive count suggests more high cards are left, which is advantageous for the player, leading them to increase their bet and make more aggressive plays. Conversely, a negative or neutral count indicates the deck is rich in low cards, prompting players to bet less and play more conservatively. This strategy aims to give players an edge by capitalizing on favorable deck compositions.