Notes on which cards have been played or discarded during the game are a useful tool for identifying patterns. In order to better determine which cards are probably still in use and which game rummyones might be useful for their own hands, players can mentally note which cards are no longer available. For instance, it is less likely that an opponent will be able to form a set with fives if multiple fives have already been discarded. observing the movements of the opposition. Players should also be aware of the suits and ranks of the cards their opponents are drawing.