www.martialguy.com my site. keyword yiquan 4th page in google now. just month ago.it is in 22th page in google ,then 11th page then 7th page. I just create a external link (and rank from 7th page to 4th page)IN KEYWORD yiquan in digg.com. but with different page.I am page that indexed in 4th serp in google is different I see google rank algorithm is very uncertainty.
That is why they call it the google dance. Remember everyone targeting that keyword is doing the exact same thing you are building links, writing content, etc it more akin to "king of the hill" then positions in a company