One can learn about the possible hands of other players by closely observing the cards they discard or pick up. You can safely gather high-value cards for your own melds, for example, if youplaying online slotsr opponent routinely discards them, as this may suggest that they are not pursuing those ranks. If, on the other hand, an opponent picks up a card you just discarded, you might want to change your approach to keep them from finishing their hand. Taking care of your own waste is also essential. It can be dangerous to discard high-point cards when an opponent is about to go out.