Conversely, if a rival routinely removes particular cards from the discard pile, it can mean that those cards are crucial to their plan and ought to be used carefully or kept. Observing the movements of their rirummy model 51vals allows players to modify their tactics and improve their chances of winning. When playing 777 Rummy, timing your knocks is a crucial strategic move. When a player concludes their turn in 777 Rummy by announcing that they have formed all of their cards into valid sets & runs and are prepared to go out, this is known as knocking. A knocker must place all of their melds on the table for the other players to validate.