Yahoo vs. Google ranking

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For my keyword "kennzeichenhalter" (license plate holder) I'm
no. 1 in Google for many month (before florida and after florida).
In Yahoo im only no. 16 and no. 1 is PDF file!
A PDF file does not have all the things important for SEO, how can
this be no. 1?
What is **really** important in Yahoo?
Any suggestions?

Gerhard /

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