To make better decisions about which cards to pick up and which to discard, you can obtain important information about which cards are still in play by keeping track of the cards that have been played and discarded. Obssatta. king resulterving carefully at the cards that other players are picking up and discarding is a good method to become an expert card counter. By doing this, you can begin to form an idea of which cards are likely to be available for you to pick up and which are still in play. You can also reduce the number of possible outcomes for the cards that are still in play by keeping track of the cards that have been played in runs and sets on the table.