Major keyword for site now in Supplemental Index

Site added to Google's Webmaster tool - Coincidence?

[Pass the Dutchie]

Not sure if this is a coincidence but about 10 days ago I wanted to 'force' Google not to index non-www. Despite having a 301 redirect in place for the past 3 years I noticed that when I removed the 301 the non-www had a PR5. So on top of the 301 I also set up a webmaster Google account for this domain and instructed Google to index www and not –non-www.

For the past 3-4 years our site's homepage held a rock solid position at number 6. Yesterday I searched for the single keyword which was nowhere to be found. I then navigated to the last result for that search, clicked on the supplemental results and the site in question was listed as it was a few days ago, at position 6.

This change only seems to have affected this one single keyword in both singular and plural. Other keywords remain unaffected and I sincerely hope they remain that way.

Is anyone else seeing this after submitting site to Google's webmaster tools? Tedster, I have read many of your posts on this topic and I would really appreciate your input on this.

Notes:

allintitle: (no position change in serp at nos. 6)
allinurl: (nowhere to be found)
allinanchor: (no position change in serp at nos. 6)

Current 'live' results and supplemental results are comming from 209.85.135.104 datacentre. It appears to be the only data centre which features our site in the supplemental index. All the other datacenters display site in our usual serp position which is encouraging.

[Pass the Dutchie]

Additional note:

Site last crawled 19th July. It was from this point that the search term in question could only be found in the supplemental list.

[tedster]

I then navigated to the last result for that search, clicked on the supplemental results

Do you mean that you clicked on the "Omitted Results" link? If so, that's not the same as a supplemental result. It's often more of a duplicate filter issue. When your URL does appear after that click, is it tagged with a green "Supplemental Result"?

[Pass the Dutchie]

Doh! I thought the omitted results was the supplemental index. Thanks for pointing out the difference.

Do you know why a single specific keyword, which my site has performed well for a number of years, would have been added to the omited results (at the same poistion)?

Thanks again

Dutchie

[edited by: Pass_the_Dutchie at 5:30 pm (utc) on July 24, 2007]