Index doorway trick (or some magic :)

[Mr. Blue]

Originally Posted by Mcbethar

Here you got an useful tool (posted by PointingPercy on another thread on the SEO forum) to see if your site may be falling victim to the Google duplicate content filter. Apparently a duplicate rating of 75 - 80% is pretty bad news for your SEP's.
http://www.webconfs.com/similar-page-checker.php - Duplicate content tool.
Hope it helps

Mcbethar

TY, looks like a good way to check.