Players can learn a lot about their opponents' strategies and make calculated moves to thwart them by keeping an eye on the cards they discard. Recognizing Various Combinations. Undteen pataerstanding the various combinations that can be made is crucial for becoming a successful rummy player. Three or more consecutive cards of the same suit, for instance, without any jokers, make up a pure sequence, whereas at least one joker is present in an impure sequence. Jokers can also be used as wild cards to form sets, which further complicates the game.