http://www.familytreedna.com/faq2.html has an explanation of the method for figuring out the most recent common ancestor when your Y-DNA matches another. You can see that the more markers that match, the closer the common ancestor. The Bunker Family Assn. uses the 12 marker test but any of our participants can increase their number of markers tested by paying an additional fee. It does not require a new sample. They use the one they already have. If you are interested in DNA testing http://www.familytreedna.com has a lot of information and links to other pages for even more. If you are a male and born a Bunker, we are looking for more participants all the time. We get a discount as we are part of a project. If you are interested let me know. Bette