Yahoo gives importance to link and its anchor text.
More the link with good anchor text, more chances of your site to be on first page.
But Google checks the relevancy of the link based on major factors like:
Anchor text, Page theme, Site theme, Site's age and value on which your links there, link age, etc. etc.
If you want to be on Yahoo, try to aquire more and more back links with good anchor text and put keywords in title, description of home page, put some keywords in site's content too.

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!!! Enjoy !!!
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Happy Optimization
Internet Marketing Consultant
SEO Company