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I Checked personal site right before this and had right at 160 now 130 so this does show supplemental I am not so sure it is updated.
I checked another one I oversee right before this hit had over a 1000 not supplemental this method shows 500. I don't think this site lost 500 pages in a week as traffic is steady.
I wonder why the big differences now?
Since 2006, we've completely overhauled the system that crawls and indexes supplemental results....We're also working towards showing more Supplemental Results by ensuring that every query is able to search the supplemental index, and expect to roll this out over the course of the summer.
Of course, you will continue to benefit from Google's supplemental index being deeper and fresher.
So as people already pointed out, if your page falls into Supplemental Results, you still have a problem (it will NOT compete in SERPs), yet people will still be able to find it. Right, on page 57.
Yet, you will have no way of knowing it.
It's about time someone started a company and make a fortune on making tools that disappear from Google.
If every day there are more pages in Internet by noses the additional results will have more and more to be, no?
So here you have a site with 2600 ugly url's with the exact title and description for every page on the site and it's not supplemental
Got 1 big link in Google showing 1900 in yahoo.
This makes no sense at all plus it is showing up for some very tough single keywords.
I really believe the google algo is out and the human ranking is why this site is were it is as there is nothing in the SEO, links, information, no forum nothing
The site should be supplemental to the hilt but isn't so why do we find sites that just don't make sense in the serps...Got to be human intervention as the only possible answer.
Those issues will still exist, and will still cause grief for sites, but may now be much harder to spot by those who are unsure what they are looking for.
I, as a webmaster, don't want to have to worry about supplemental versus non-supplemental. I know, knowledge is power, but it is also stress... and if there is one thing I have learned over the years... over-analysis using any tool can be the death of you.
I for one am glad it is going away... since it will free up my time for more productive things... =)
Pages with low PR
Pages listed two different ways (both relative and full links, session IDs, etc.)
PDF files (because of no PR)
Deleting pages without setting them up as "gone" in htacess.
Someone may have copied the page.
Using distributor copy for your products
Too little data on the page compared to the header/footer, menu and other duplicated text showing on other pages.
Websites that are pagerank 8 at the home page and are authority can have thousands of those pages you describe that are not in the supplemental index, depending on internal pagerank and link heirarchy.
It's next to impossible to 'guesstimate' which pages could be supplemental or not on most quality websites.
Unfortunately to me this takes more control away from site owners and webmasters.
I'm not 100% positive, but...
...seems to return only pages that aren't in the main index, i.e. suupplemental
It's the incomplete indexing of content for Supplemental Results urls in the past that troubles me. When even a PR4 page can be supplemental, lots of useful results could be obscured. If it's true that the line between the Supplemental Index and the main index is getting fuzzier and fuzzier -- that the supplemental "partition" of Google's index is evolving more and more -- then this removal of the Supplemental Result tag makes some sense to me.
Notwithstanding, supplemental results are bad.
Supplemental results are analogous to racial segregation.
No "Supplemental Result" is permitted to appear with "Main Index" SERPS.
However, "Main Index Results" are allowed appear with "Supplemental Results" SERPS as desired.
If a search yeilds more than some cutoff (500 or so?) number of results, it is probably "Main Index" serps, and THOSE "Supplemental Results" are not allowed here.
I have read hundreds ... or thousands of explanations regarding supplemental results, but the above is what I have observed.