what's happened on this site

domain:sforil(dot)com

the site was setup on 2013-9-4. It's rank for #1 on keyword "cheap beats by dre" but i can not see any exact match anchor. Could anybody tell my the reason?

It's 5 days old, it takes time until the backlinks are crawled by Ahrefs or MajesticSEO or whatever tool you use for checking backlinks.
Also, after the recent algo updates, I saw a few sites ranking without any related anchors whatsoever. Considering, that G is now penalizing websites with low anchor text variation and way too many percents of exact match anchor text, it's logical, that the anchor texts do not play such a big role as they were before these updates. Don't get me wrong, they are still important but from what I saw, websites can be ranked even without using exact match or sometimes even related anchor texts. It all comes to the quality of the backlink.

Yeh and the common method these days, just as Tactician below me said, is a 301 redirect. There are many threads on this subject here.

They have a 301 redirect pointing to it from another headphone based website however it doesn't really have many links from different domains can't see them keeping that position for long as well as you outing them on bhw

I hate it when specific sites are outed for their ranking.