In 2005 it was decide to reduce the number of Premiership One teams from 12 to 10.
To fill the empty calendar spots left free by the reduced number of league matches, it was decided to introduce this new competition.
After only one year it was decided to expand again the number of Premiership One and the Super Cup was abandoned.
www.bbc.com - BBC site
www.scottishrugby.org/ - Scottish rugby union site
en.wikipedia.org/wiki/Rugby_union_in_Scotland - Wikipedia pages about scottish rugby
Every site was scanned using also web.archive.org