It can be harmful to discard a card that could aid an opponent in finishing a meld, so players should try to keep cards that add to their own melds and discard cardrummy apps that are less likely to be helpful to others. Another layer of Rummy strategy is knowing when to draw from the stockpile versus the discard pile. Players can gain instant advantages by using the discard pile to finish melds more quickly, but opponents can also learn about intentions and modify their strategies accordingly.