The risks of discarding a card that might be useful to their opponents must be balanced against the possible rewards of drawing a new card. Discarding high-value cards that you think have little chance of forming melds is a commogold satta telegramn tactic. If you are holding onto a high card, such as an Ace, but your hand is full of low-value cards, it might be prudent to discard it if you believe your opponents are not building around that rank. Also, knowing how the game progresses can help you make wise choices regarding drawing and discarding. It might be a sign that an opponent is about to form a meld with those cards if you observe that they are routinely taking cards from the discard pile.