Seeing how they play will give you important information about their hand, allowing you to modify your own strategy accordingly. For example, you might want to refrain from piaviator hackercking up cards of a particular suit if you see that your opponent is routinely discarding high-value cards from that suit in an effort to stop them from finishing a sequence. Throw Away Carefully. Also, you should be careful about which cards you are discarding because you don't want to unintentionally aid your opponents in finishing their melds.