The system never claims it on it's own, neither would an arbitrer in otb chess, one of the players has to claim the draw once the treefold repetition occur.
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hi,days ago i played a live chess game http://www.chess.com/livechess/game.html?id=102211357. As you can see move no. 41-87 there was a several perpetuals and it should be atlast drawn 20 times!But the system never take it so i play on and due to time pre. my opponent blundered.I said sorry to my opponent but I really want to know why this happened.Any clue from any one??Thanking in advanced