Even when the time control has been reached, there is one situation where you want to act as if it has not: when your position is absolutely lost.
Edmar MednisOnly play into a variation in which your opponent is strong if you have your own personal novelty ready!
Edmar MednisBobby Fischer started off each game with a great advantage: after the opening he had used less time than his opponent and thus had more time available later on. The major reason why he never had serious time pressure was that his rapid opening play simply left sufficient time for the middlegame.
Edmar Mednis