Effective gameplay requires striking a balance between keeping flexibility & holding valuable cards. Another common error made by players is to ignore what their opponsatta/kingents are doing. Missed opportunities for strategic play can result from not paying attention to what other people are picking up or discarding. An indication of an opponent's intention to form particular melds could be seen, for instance, if they routinely select cards from the discard pile that are similar to yours in rank or suit.
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