nginx rewrite redirect

hello, everyone. I have a old forum script, I move it to xf 1.5.6 but now the old url can't redirect to new's. my old url is http://bbs.example.com/forum.php?mod=viewthread&tid=409493&page=1&authorid=84701 and new url is http://bbs.example.com/threads/409493/ I write a nginx rewrite as blow...

This nginx configuration file will rewrite properly for both Wordpress / W3 TotalCache and Xenforo nested in the same folder like this : /home/you/public_html/domain.com/public/community so the URL is like so : www.domain.com ----> Wordpress and www.domain.com/community ------> Xenforo You will...