Yes, you can use Blackjack strategy charts in a casino, as they are typically allowed and not considered cheating. These charts help you make mathematically optimal decisions based on the dealer’s upcard and your hand, and most casinos do not have an issue with players using them. However, there are some things to consider. For one, it’s important to use a small and discreet chart, such as a laminated card, to avoid drawing unnecessary attention. Larger or more conspicuous charts might raise suspicion. Additionally, while using a chart is fine, you should be mindful of how much time you spend referring to it, as constantly checking it can slow down the game and annoy other players or the dealer. Lastly, while strategy charts are permissible, combining them with more advanced techniques like card counting could attract unwanted attention, since casinos might view such behavior as an attempt to gain an unfair advantage. Overall, using a strategy chart is generally acceptable as long as you do so discreetly and don’t disrupt the flow of the game.