Yahoo Ranking Important factors?

[SearchBliss]

I have a question: 1. What's the meaning for related link ? 2. some web site has only 10 link can also go to first position..why ? 3. they have linked from directory .. is it useful not other link ? 4. Is the subdomain is not good ?

 

[Mars Guitars]

Yahoo uses mainly keywords and even meta tags for their SERPs

Unlike Google, they place less value on IBLs