I enjoy going down the list of DNA matches on 23 and ME, and trying to pin down the paper trail to put them in the tree. A few days ago, 3 new males popped up, and I was quickly able to find out that they were 3rd cousins thru the Wright/Sessions family of NC. All 3 were 2nd cousins of each other, and unaware of any of these relationships. It was fun! Then I noticed that one of them shared 40 cM on the X chromosome with me. I've never noted this before. Males with an X match? I looked it up.... the company says X matches are significant for females at 3 cM , and at 1 cM for males. We got this segment from our GGGM Eliza Jane Cromartie (Cromartie-12). The other two 3rd cousin males lost this X match on the way down, as they had two males in a row in their lines, which automatically deletes an X. Then I checked for other 23 testers who had this segment, and found 3 right away, one sharing a paper trail back 9 generations to Sarah (Ransom) Sessions (1711-1812) (Ransom -370). I searched some more and found 14 others with this same X segment match. I know that the size of an X match does not correlate with the distance of the relationship, but it does point us in the right direction. Is there an X chromosome discussion group on wiki? Who would be our experts? I have read what Blaine Bettinger has to say about it.