Knowing which cards could be helpful to opponents in addition to being aware of one's own hand is necessary for this. Keeping high-value cards that don't addslots game with bonus to a meld, for example, can be dangerous because they could result in heavy penalties if an opponent goes out. Adaptability is another essential component of creating a successful strategy. The dynamics at the table change as the game goes on, so players need to be ready to modify their strategies accordingly.
odfe