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The yorker can give you an advantage in a pivotal moment. Delivering a yorker properly lands it on the batsman's feet. Batsmen have practically no time to react to this kind of throw and dig out the ball. Remember, the yorker is your ace-in-the-hole. If your opponents are on guard for your yorker from the start, it could cost you later on when you need it the most. Using a variety of throws has the added bonus of improving your odds of a successful throw. To improve variety, you might try bowling inswingers, outswingers, and throwing balls with offspin. Especially during a big game, you might want to hold off on attempting a yorker until you're well-practiced and confident in your ability. Nerves could turn your yorker delivery into an easy hit if you're not careful.
Bowl a yorker towards the end of close games. Use a variety of throws so opponents are unprepared for a yorker. Save yorkers for when you feel confident.