We did some maintenance today, and moved our web forums from /forums into the root folder of the domain.
We put in a redirect 301 in a .htaccess file:
Redirect 301 /forums/ http://www.ourforums.com/
RewriteRule ^/forums/forums http://www.ourforums.com/boards/ [NC,R=301,L]
Manually adding redirect statements like so seems to do the trick for me:
Redirect /forums/forums/forum.1 http://www.ourforums.com/boards/forum.1