A card counter at a Blackjack table can often be spotted by their betting patterns, which vary based on the count of high or low cards remaining in the deck. They tend to increase their bets when the deck is favorable and decrease them when it’s not. Card counters also exhibit intense focus on the cards being dealt and may avoid distractions, unlike other players who might chat or appear more relaxed. They might sometimes deviate from basic strategy based on the count, making unusual decisions like standing when they’d normally hit or doubling down when the deck is advantageous. Additionally, they may show calmness after a loss and appear unaffected by bad hands, while non-counters often show more emotion. Overall, the most noticeable behaviors include fluctuations in bet size, unusual strategy choices, and a high level of attention to the game, which are all things casinos look for to detect counters.