http://www.chess.com/tournaments/help.html#tiebreak
You're welcome in advance. 
Tie break score
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I don't have the link, but your tie break score is the sum of the regular score of opponents that you have defeated. If you played against an opponent with three points out of ten and you beat him and drew against him, you would have a tie break score of 3 (from the win) + 1.5 (from the draw) = 4.5. (Your tie break score)
Sorry if this topic's been posted before! If so could someone post a link? .... just want to find out how the Tie break score is calculated. thx