A large portion of the game involves paying close attention to the actions and strategies of your opponents, so mastering Rummy calls for a blend of skill and strategy. Through careful observation of the cards they draw anapkplayd discard, you can learn a great deal about their hands and intentions. An opponent may be attempting to finish a run or set in a particular suit or rank if, for example, they routinely remove cards from the discard pile that belong to that suit or rank. Informing Your Decisions. By strategically blocking their progress while advancing your own, you can use this information to guide your own decisions about which cards to keep or discard.