Keeping a close eye on the cards your opponents discard is an important tactic because it can reveal important information about their hand. Players can determine whrummyyes.comat sets or runs their opponents are trying to form by watching which cards are picked up or discarded. Also, it's critical to keep a balanced hand by holding onto cards that can be used in a variety of ways. Also, players should be aware of their own discards because giving opponents too much information can work against them.