hi vince,
at a section, area match, or larger, the uspsa will use the match as a classifier if there is 3 or more GMs in that division. i
if someone is unclassified, and the requriement above is met, then that match is used as a classifier for that competitor.
hope this helps.
lynn
p.s. correct me if i'm wrong, vince, only major matches, levels 1, 2 or 3 are used for classification in other ipsc regions.