Keeping your hand in check and maintaining organization is also crucial because it will make it easier for you to remember which cards you already have and which ones you'll need to finish sets and runsrummy all list. Observing the Moves of Your Enemy. Anticipating the moves of your opponents and determining the optimal time to declare in order to win the game are also important aspects of knowing when to declare and go out. All things considered, knowing when to declare and when to fold demands thoughtful analysis, tactical judgment, and a sharp sense of which cards other players are picking up and discarding.