Risk and reward must be balanced; if a high-value card can result in a big meld later in the game, it might be worthwhile to keep it. Take into account the probability of drawicash rummyng that card based on what has already been played, for instance, if you have two hearts & are waiting for a third to finish a run. Gaining a thorough understanding of important card combinations can greatly improve your rummy play. Knowing which combinations are worth more than others will help you decide which cards to keep & which to throw away.