You can modify your strategy to increase your chances of winning at rummy by knowing when to form and when to break melds. Observing Their Motions. To learn imprummy boldortant information about your opponents' hands and predict their next move, it's imperative to watch them closely when playing rummy. Making educated decisions about which cards to keep and which to discard can be aided by observing which cards they pick up & discard. This will let you gain insight into their strategy.