Understanding how to read the emotions and actions of your opponents is a crucial skill for anyone interested in becoming an expert bluffer in rummy. You can sbi applearn a lot about their hand and strategy by seeing how they react to your discards & plays. An opponent may be uncertain about your hand if they exhibit hesitation or anxiety, for instance, when picking up a card you have discarded. An opponent may also have a strong hand if they come across as assured & at ease.