If you use them too soon, your opponents may learn of your intentions and be able to modify their tactics accordingly. Also, think about using jokers both osattakingyffensively and defensively. Using a joker to finish your own melds when you see an opponent is about to declare with a strong hand can help you win by keeping them from reaching their objective first. By using this two-pronged strategy, you can both maximize the value of jokers & thwart your opponents' plans.