Triangulation means that all three, or more, people much match on a common segment. Reasonably sized segments are generally considered to be 7cM or above on chromosomes 1-22 and 15cM or above for the X chromosome. You can confirm mathematical triangulation, numbers 1 and 2, above, without knowing the identity of the common ancestor. Without triangulation, you might just have a match to someone else by chance. Triangulation is the foundation of confirming descent from a common ancestor, and thereby assigning a specific segment to that ancestor.
If you don’t need the tutorial, skip to the “Triangulation at MyHeritage” section. This first section, “What is Triangulation” is a generic tutorial.
You may want to read the introductory article first. This article, and the rest in the “Triangulation in Action” series introduces triangulation at FamilyTreeDNA, MyHeritage, 23andMe, GedMatch and DNAPainter, explaining how to use triangulation to confirm descent from a common ancestor. The “Home Run” article explains why you want to use a chromosome browser, what you’re seeing and what it means to you. Recently, I published the article, Hitting a Genealogy Home Run Using Your Double-Sided Two-Faced Chromosomes While Avoiding Imposters.
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