## WARNING : Topic title injection in URL can be hard to deal with depending on the type of subjects your
## forum is about. In almost all cases phpBB SEO recommend the use of the phpBB SEO mixed mod Rewrite instead.
and
Using advanced: Because you don't want to end up with 80% of your topic URLs being like "oh-this-is-so-cool-i-can-t-believe-it-vtXX.html", this would end up not optimizing anything anymore.
Can you explain more?
If I use advanced, I can have a lot of specific topic pages, with many keywords in each topic title...
topic-title1-vtAA.html
topic-title2-vtBB.html
topic-title3-vtCC.html
If I use mixed, then each topic will have the same string in the URL... isn't that worse?
string-vtAA.html
string-vtBB.html
string-vtCC.html
If I use mixed, does that mean the string will give my site higher pagerank? But what if a forum has many topics.. like football, you want to have many different players names in the topic URL, so that when people search for a player's name your site would be in the results... not just when they search "football".
Thank you for clarifying

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