Grandmasters tell me.
Several years ago I was playing in the chess club. My level is about 1350 Elo. I had an important game to go, I could win the title in the lower class. The rate of play was 2 hours for 40. My situation on the board was lost. My opponent don't pressed his clock. He had still 45 minutes on his clock. So the clock of my opponent counted down. I played the role of my life: I pretended I was thinking. I won the game on time, my opponent was very angry. Fair or unfair? What do you do in this situation?