question about the new class eliminations

[C and W Racing]

If you enter a national event that has class eliminations and you are the only one in your class, I understand that you now have to run someone else that may be the only one in their class as well. My question is, if there are say 10 people that are the only one in their class, do you just run one and the winner of that pair wins the trophy, or do you now have to run the winner of one of the other pairs, etc until there are only two left and the winner of that race wins the trophy and contingency.
Just trying to understand all the new enhancements. lol
Chuck