Neil The FTDNA Triangulator does have the ability to compare your Matches to confirm 3-way Triangulation - so it should be more accurate. But it’s like 99.9% accurate vs just 99% with DMT. My point here is that both methods, or GEDmatch Tier 1 Triangulation, 23andMe ICW+Yes, and even FTDNA ICW+Overlap methods will result in very nearly the same result: Triangulated Groups (TGs). Any errors will be very small. And if you follow the concept of Genealogy Triangulation - and get several Matches in a TG to agree on the same ancestral line... well - what’s not to like? We have restated many times that a single CA (Common Ancestor), even in a TG, means a ”clue” - it’s not by any stretch a “proof”. So my recommendation is to form TGs by whatever method works for you. And, when using atDNA, always be open to adjustment. At the end of the day, each shared IBD segment has to be on your paternal chromosome or your maternal chromosome. It’s hard to mix these up with any TG method. Jim Bartlett - atDNA blog: www.segmentology.org > On Oct 26, 2017, at 11:05 AM, Neil Story <[email protected]> wrote: > > I’m not clear on whether the FTDNA Triangulator does more, less, or something different than Louis Kessler’s Double Match Triangulator (http://doublematchtriangulator.com). I have used and like the latter, and know that it doesn’t have a limit on the number of matches, and that it works with GEDmatch and 23andMe as well. Does anyone have insight on the relative merits of the two? Thank you. > > Neil Story