## What does it mean for two DNA half-matches to not match each other?

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I'm looking at my gedmatch.com kit A951428 and found close matches at the same overlapping location of chromosome 3:

Kit     Chr Start Pos   End Pos     cM      SNPs
F236166 3   25,435,600  38,396,796  14.3    3,053
F392491 3   30,260,499  42,524,347  11.9    2,767
F381005 3   30,531,357  42,392,580  11.4    2,643


Gedmatch says that F236166 is a half-match (yellow) in this region and that the F392491 and F381005 (who are closely related to each other) are also half-matches with a few scattered full matches (blue).

I compared F236166 and F392491 and got no overlap, so I assume that means they half match my kit on opposite sides of the DNA. Does that suggest that the two kits with no overlap are completely unrelated and thus will not help refine the relationship between my kit and F392491?

I'm interested in tracking down the unknown relation that is suggested to be a 4th level cousin between my kit and F392491 which only match at this location in chromosome 3, hence, I found overlapping matches at that location and only found this F236166 kit for an overlapping position.

How might I use these DNA tools and data to get additional data points to help triangulate exactly how we are related? I believe the relation is through the Austria region and have no paper records for my connections there, hence, DNA is my best hope at this point.

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While you are waiting for an answer, take a look at the basic resource list I compiled for this answer -- just above the section marked "generational loss". Roberta Estes' posts on Triangulation might be especially helpful.

– Jan Murphy – 2015-08-01T01:35:47.813

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@lkessler is this something that your DMT could help with? http://www.beholdgenealogy.com/dmt.php

– Jan Murphy – 2016-12-28T07:36:53.007

It means that you do not have a triangulation group. In this case, F236166 is a match to A951428 on chromosome 3 between 25M and 38M and close relations F392491 and F381005 match to A951428 on chromosome 3 between 30M and 42M, but F236166 does not match F392491 and F381005 on chromosome 3. Therefore F236166 is matching the DNA that came from one parent of A951428 while F392491 and F381005 are matching the DNA that came from the other parent of A951428.