I thought there had been discussion in the past about there being some sort of reason for being placed on position 10, and google bouncing you from 10th to second page, 11th but I couldnt find it.
I've been watching this go on for two pages I have that were once penalized (for what I believe to be over-optimization). Penalty ranged from not ranking, to ranking on page 6 to page 3. It was #1 for many years across most of it's targeted keywords.
But they've been doing this bounce for more than a few months, and I see certain newer pages of sites pop-up on page 1 (position 9) for the day then disappear, likely for their....what's the seo term...temporary new page/site boost.
Does anyone know if there is some sort of testing that google does for these types of positions for certain keywords? Maybe a trust check or a "time on page", "bounce rate" "whatever check" to see where it ultimately belongs?