It has to be remembered that many Number One's (those with averages of nine and above several of which headed their particular team's average) didn't actually ride at Number One but either at Number Three or Five and therefore met an opposite Number One twice during a match. Riders who achieved averages in excess of nine plus riding at number three or five include Ashby, Lovaas, Jessup, Boulger, Wilson, Simmons, Autrey, Collins, Gundersen, Tatum, P. Crump, Jansson, Hedge , Sanders, Lee, Sigalos etc etc.
Fixed gare postions came into being during 1988 if memory serves.