To help you predict which cards might be safe to pick up from the discard pile, it can also be helpful to keep track of the cards that other rummy 2023players have discarded. Understanding important card combinations in Rummy is crucial to winning. A set, which is made up of three or four cards of the same rank, is a crucial combination to keep an eye on. Any card rank can be used to create sets, such as three 7s or four Queens.