Is there a way I don't see to search BoB shelves by a second level genre?

I'm looking for RPG books, which are often in Science Fiction Fantasy->Gaming. 

I see how to search by SFF books, but I don't see how to narrow it to just the Gaming sub-genre.  SFF is simply way too broad and the search results are not useful in finding people with the RPG books. 

You may have found this by now, but I just looked at it and you can search that way.  When you go to the Box-o-Books page, the first box is labeled "Search Box-o-Books Members."  Go to the area below that labeled "Browse by Genre" and it will let you choose a second level genre.

Ah-ha!  I was one box up, under (logically to me) searching boxer books.  I hadn't even noticed one could browse--and I would have expected just a list of books not of shelves.

I wonder why searching w/a genre does the same as browsing, except browsing has the extra feature of sub-genres?

Well, maybe I won't ask why too much, and just say thank you very much, that's what I was looking for!