Will this work?

I am using a static archives file:

www.notmydomainname/forums/archive.php (this is not my domain name)

I cannot use the modrewrite by AbletoKnow for my phpbb forum. I have that common problem where the second page does not show when the mod rewrite is applied. I've posted on several forums and no one has an answer.

It actually appears better than the mod rewrite because it generates page titles for each topic post. My only problem is that search engines will not index it because of duplicate content. Google visits the archive url and goes no further towards indexing it.

So, I have an idea and I want to get some opinions. What if I were to use the robots.txt file to ban robots from indexing my forums/index.php file. The hope would be that they would then index my forums/archive.php file.

Does anyone think that would work?