You can learn a lot about your opponent's hand by watching which cards they are discarding or picking up, and you can then modify your own play to increase your chances of winning. You can also learn which crummy teen pattiards are safe to discard and which ones to hold onto by paying attention to the cards that have been picked up from the open deck. Ultimately, the key to winning big at rummy is efficient resource management. You can improve your chances of creating potent sets and sequences and winning the game quickly by keeping track of the cards you have in hand and making wise decisions about which ones to keep or discard.