You have to claim a draw just like OTB, it's not automatic.
http://support.chess.com/Knowledgebase/Article/View/40/0/how-do-i-claim-a-draw
WHAT SYSTEM WE USED?
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SOMEBODY CAN TELL ME , WHY WE CANT ACHIEVE A DRAW EVEN WE REPEAT 3TIMES AT THE SAME MOVE??
WHY DON'T DRAW??
MONDAY , 03JAN2014.