Keeping a close eye on the cards your opponents are discarding is one useful tactic. You can learn a lot about their possible melds by keeping track of trummy luxuryhe cards they discard or pick up, and you can modify your own play accordingly. An opponent may be attempting to finish a run in a given suit, for example, if they routinely discard cards from that suit. You can improve your chances of winning by holding onto cards that might interfere with their plans.