In the event that your opponent declares Rummy before you do, high-value cards could be harmful because they will increase your overall score if you lose. For example, it could be better to throw away game like mpla King♣ or Queen♦ if you don't need them right away rather than taking the chance of keeping them for too long. Always assess a card's fit into your current hand before selecting it from the discard pile. Picking up a card that completes a run or set can be helpful, but if it doesn't significantly advance your plan, think about whether it's worth the chance of your opponents learning your strategy.
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