Supplemental Results Threshold for Appearing in the SERP

[Neuro2006]

Supplemental Results are often provided by Google if there are few or no 'standard' results for a search term. What is the number of standard results below which supplemental results are given, or does this number vary depending on the search term?

[hvacdirect]

I used to believe this as well, however I have supplimental pages showing up on page 1 when there are 10,000+ other pages. Then again, perhaps the page count is off so much that it just appears this way.

[g1smd]

There are several types of supplemental results.

Some are harmful (those that represent duplicate content) while others are not (those that show for older content searches for normally indexed URLs).

[webmasterworld.com...]