what is Criteria in tie break?

what is Criteria in tie break?
I'm confused

help meeeeeeeeeeeeeee

Have you already tried the site search?

http://www.chess.com/tournaments/help#tiebreak

thanks paul so helpful, I  love you :-*

But this method is not fair

If 2 players in a group have the same score and same tie break , than ???

That's covered in the first paragraph of the explanation:

"What happens when there is a tied score? And what is the Tie Break?

If 2 players in a group have the same score then both will advance. Tournament Directors can choose to use an additional tie-break method (we use the Neustadtl score) which factors in the strength of the opponents. If two players have the same score and the same Tie Break score, both will advance....."

thanks paul