In matchups between two or more named horses, all horses must go for wagers to have action.
Matchups are determined by horse name. Any track coupling is irrelevant towards determining the winner of a matchup.
In matchups between one named horse and the Field, wagers will have action if and only if the named horse starts. Scratches of horses in the Field will not affect the standing of the wager.
The winner of a matchup will be determined by the highest placed finisher involved in the matchup. If no horse finishes, the matchup will be graded no action.