can some1 please convert this htaccess to nginx rewrite?

[Lemon Head]

sorry for the late response guys had some busy days
i still have some problems accessing the forum,if i access 
http://site/forum/
it redirects to http://site/index.php which shouldnt happen,if i access 
http://site/forum i get "Internet Explorer cannot display the webpage"
but http://site/forum/index.php works fine,any suggestions?
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