Hi all. I went to a talk by a local expert recently. She was able to outline how the X Chromosome could be used to narrow down choices on the maternal side. This information is included in FTdna Family Finder tests. In Matches or the Chromosome Browser just click on selection and chose X matches. If you look at X Chromosome sites on internet you will not have any difficulty finding a useful chart which will help ID lines concerned. As females get an X Chromosome from both their father and mother and males an X Chromosome from mother only several lines on your maternal side or fathers mothers side quickly become clear. Regards Chas Le Breton