Placing Pure Sequences on a Firm Basis. Since pure sequences are essential to a winning rummy hand, one important tactic is to concentrate on creating tsatta king charthem early in the game. A straight line of cards from the same suit that don't include jokers is called a pure sequence. You can make sure that you have a solid foundation for building the remainder of your hand by giving the formation of pure sequences top priority. Analyzing the Moves of Your Rivals.