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RewriteEngine On
RewriteBase /
RewriteRule ^forum/(.*)$ http://forum.example.com/$1 [R=301,L]

In the domain's root .htaccess should do it, at least, it should not go 404 if the path are correct.

I solved my problem by removing # from :

RewriteCond %{HTTP_HOST} !^www\.forum\.pariuri-x\.ro$ [NC]
RewriteRule ^(.*)$ http://www.forum.pariuri-x.ro/$1 [QSA,L,R=301]

I putted in mian htaccesss the 301 redirect didn't worked, i readed lot's of solution none work, after few test i resolved the problem like i sayed remove # from front of :

RewriteCond %{HTTP_HOST} !^www\.forum\.pariuri-x\.ro$ [NC]
RewriteRule ^(.*)$ http://www.forum.pariuri-x.ro/$1 [QSA,L,R=301]

Look : http://www.forum.pariuri-x.ro/ now it's work great even from google is redirected like it supose.