it is simple .. somebody wanted to quit a group.. the easiest way is invite any person who wish to own a group..
and you seemed a perfect candidate... so as soon as you entered the group you are appointed as the superadmin...
and it is not bad to own a group.. 
since you already have 90+ groups.
and as you are a premium member you can be helpful for teams that need superadmin... some teams still struggle to find replacement for inactive superadmins..
Done :)
@ Kohai, Many thanks for a speedy reply and action , but still not happy that I can be made a super admin without my knowledge of it.
@ Sajay, Dont see how many groups Im in has any relevance to the question, dont want to ' own ' any groups either.
no.. just mentioned that is all...
the epic and ultimate fighters
openings
national chess, learn the way to play, gambitters, worldwide chess 2 and i believe that's it because they only have 1 or two members
Greetings, I was invited to join a small group some time ago. I now find that my inviter has left, I am the only Super admin and as such cant leave.
I would like to leave / disband the group ( which is doing nothing), and also ask can I be made a super admin without my knowledge or acceptance? I also find that in some groups I am admin , again without my knowledge or acceptance. This does not bother me too much except that I may find myself the only super admin in those too at some stage. ( Its happened once, it could happen again.)
The particular group I want to quit is '10000 pawns, progressive leadership.'
Bearing in mind the Super Admin title and what it involves , surely there can be some way of avoiding finding oneself in this situation?
Thanks.