Yahoo! owns many trademark registrations for the "Yahoo" mark all over the world.Therefore,it has managed to demonstrate that the disputed domain name is confusingly similar to its trademark.
Moreover,the company managed to demonstrate that the respondent registered and used the disputed domain name in bad faith :
"The disputed domain name resolves to a website offering both competing service and links to competing services. Respondent receives click-through fees when Internet users click on the links offered. Because of the services offered on the website, consumers may be confused into believing Complainant is affiliated with Respondent and Respondent’s website. "
The Panel ordered the disputed domain name to be transferred from the respondent to the complainant.
You can read the decision here .