To better understand the 6.0 system, a tie breaker was the highest Performance Score.
We were talking about the tie breakers for getting into the Grand Prix Final, not the tie-breakers to determine the winner of an individual competition.
Disregard MM's first paragraph above, as it distorts skating history.
Just to make sure we don't distort any history here....
I think what you mean to say is that the tie-breaker for the
long program was the performance mark. For the short program it was the technical mark.
Historically, it wasn't always that way. In the 1988 Olympics, the tie breaker in the long program for men was the technical mark. For women in was the performance mark. In the LP, Brian Orser won four judges, Brian Boitano won three, with two tied. Boitano won the two tied votes because he won the
technical mark.
After that, the rule was changed to make the tie-breaker the performance mark in the LP for both men and women.
These were the tie-breakers for each judge separately. There was still the question of combining the ordinals of the nine judges, This was done by the majority of ordinals method, then changed to OBO some time in the 1990s.
Finally, with factored placements, the tie-breaker overall was the LP. (It still is, as with Lysacek over Weir at U.S. Nationals when they tied in total CoP points.)
None of this history has anything to do with the Grand Prix. But it is all true, without distortion.