One important thing to keep in mind is that in order for a declaration to be considered in rummy, it must contain at least two sequences, one of which must be a pure sequence (one that doesn't include a joker). In order to gain valuable insight into other playervivo a23s' hands & to aid you in making strategic decisions regarding which cards to discard or pick up, it's also critical to observe which cards other players are discarding. Developing Your Hand. Since forming sequences are frequently the hardest combinations to achieve, it is imperative that you concentrate your strategy on developing your hand around these formations. Observing the cards your opponents are discarding and picking up can also help you determine which cards are safe to discard and which ones you should keep.