It is not possible for a player to gain time on the clock. It appears that you are describing a case where lag on one of the player's connections was having an effect on the game and making it seem like the player was gaining extra time on the clock which is not the case.
gaining time?
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I had about 2 seconds of time and my rival had less but he checked me and before I could reply with my move he gained time and won as I ran out of time and on a regular clock I would have beaten him? Can someone explain how that works so I can also use it to my advantage like he did? Thanks