Keeping a close eye on the cards your opponents are discarding is one useful tactic. Players can learn about the cards in their opponents' hands and modify their own play by keeping tractee patti joyk of the cards they discard or pick over. If a player routinely discards cards from a certain suit, for example, it might mean that they are not pursuing runs in that suit, which would give others the opportunity to take advantage of that information. It is also possible to stop opponents from scoring easy points by holding onto valuable cards until they can be melded.
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