You can use this information to help you decide what to keep and what to throw away. Also, making good use of the discard pile requires knowing when to take chances. It might mean that an opponent is no longer pursuing a certaisattaking all chartn suit if you observe that they have discarded multiple cards from that suit without picking any up. Picking up the cards that were discarded in these situations could help you create a meld while also preventing your opponent from finishing theirs. On the other hand, since those ranks might be essential to their strategy, it might be prudent to refrain from discarding them completely if an opponent is routinely selecting them from the discard pile.