I'll share this. During any game there are 3 different times. There is the time according to your opponent's computer, there is the time on your computer, and then there is the "real time" on the server. This undoubtedly explains it better:
Bug with time limit
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I was playing a person who had one second left, no delay or time bonuses. He made his moves instantly so he obviously he used pre-move, but he reached "0" and then went back up to one, this keeping him from losing in time. He also made like 10 moves with one second left. Can anyone explain?