Each of the tags have top users, an asker and an answerer.
For example, for the mythology tag, Keshav Srinivashan is the top answerer as well as the top asker.
Similarly, for the scripture tag, Tezz is the top answerer as well as the top asker.
Now, Tezz is also the top answerer for the Purana tag (which i have found out manually).
My query is suppose i want to know all those tags, for which, Tezz is the top user, how to find that out without manual searching?
(Note that here Tezz is just an example which i have used to clarify my question. I want to know the results generally, for any given user, and not only for him)
Question: Given any user- how to find out all such tags for which he/she is the top user?