If you are aware that a number of high-ranking cards have already been discarded, for example, you can conclude that there is a much lower chance of drawing those cards. You can use this information to help you decide whetherbig top slots to keep some cards or take a chance by throwing them out. Identifying the Propensities of Opponents. Identifying patterns in gameplay is another aspect of mastering card counting. Due to their prior experiences, seasoned players frequently have a propensity to play particular hand types or strategies. You can learn a great deal about their tactics and modify your own by observing these patterns and recording the cards they pick up or eliminate.