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Why is that? Do some sites optimize better for Yahoo and others for Google? And, if you are optimal (by design or accident) for one search engine, you are suboptimal for another?
I think they use different algorithms for prioritization that gives rise to the difference. However, the exact mechanics are beyond me. But I'm still inclined to think that Yahoo! seems to bias keywords.
For long time in the past, I got more hits from Yahoo! compared with Google. I think the reason was that many URLs of my site bear ".pl" that drove Google away, but apparently Google changed something from last year onwards that I got more and more hits from Google and dynamically generated pages and URL seems to be no longer an issue. At least for me.