I have managed to redirect some of those URLs These are the rules:

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RewriteRule ^tema([0-9]+).html phpBB3/viewtopic.php?t=$1 [QSA,L]
RewriteRule ^tema([0-9]+)-([0-9]+)-asc-([0-9]+).html phpBB3/viewtopic.php?t=$1&start=$3 [QSA,L,NC]
RewriteRule ^tema([0-9]+)-([0-9]+).html phpBB3/viewtopic.php?t=$1&start=$3 [QSA,L,NC]
RewriteRule ^mensaje([0-9]+).html phpBB3/viewtopic.php?p=$1 [QSA,L,NC]
RewriteRule ^foro([0-9]+).html phpBB3/viewforum.php?f=$1 [QSA,L,NC]
RewriteRule ^foro-([0-9]+)-topicdays([0-9]+)-start([0-9]+).html phpBB3/viewforum.php?f=$1&start=$3 [QSA,L,NC]

Now I'm afraid of how will this affect to Google. I'm using a double redirection for old URLs... For example, tema1111.html --> /phpBB3/viewtopic.php?t=1111 --> /phpBB3/the-forum-f50/this-is-the-topic-t1111.html

Any ideas? Too much redirections here?

The zero duplicate is making the trick even easier.

Once installed, you'll just have to keep the old rewriterules from the old standard up an running at the end of your new .htaccess.

This way, these url will still hit the proper script, and the zero duplicate will properly redirect them (with title injection and so on).

All of this imply a single HTTP 301 redirection, it follows this principle :

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temaxxx.html => .htacesss activates /phpBB3/viewtopic.php?t=xx => HTTP 301 based on the URI (temaxxx.html) => /phpBB3/the-forum-f50/this-is-the-topic-t1111.html

Just like if you had tried a misspelled title for a topic URL.

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