I would check to see if the raw data and the comparisons are all using the correct build number, you might also want to lookup how the SNPs and CentiMorgans are distributed along the segment. I do not use Gedmatch but would also question why Gedmatch is showing fewer SNPs with a longer segment with more cM. None of my 4 Ftdna matches in that area extend past 134121902 (all 4 of my Ftdna matches are listed as the same segment 126064861-134121902, 8.38 cM, 2031 SNPs) I have no matches in that area at 23andme. RPaine -----Original Message----- From: Brooks Family via Sent: Friday, October 23, 2015 12:11 PM To: genealogy-dna@rootsweb.com Subject: Re: [DNA] Fwd: Comparison difference between gedmatch & Ftdna Not sure how that explains the much larger cM count, when the boundaries and SNPs are near identical in the two systems? On 10/23/15 1:05 PM, Robert Paine wrote: > The issue you are running into is that when you reduce the criteria > for a segment to be reported as a match the likelihood of errors > increases. Ftdna uses the most stringent criteria for reporting a > match and its length while gedmatch can be the most relaxed. > > RPaine > > -----Original Message----- From: Brooks Family via > Sent: Friday, October 23, 2015 11:29 AM FTDNA > 9 131,456,657 137,335,024 8.85 1955 > > > gedmatch near identical boundaries and SNPs, but cMs are much larger: > 9 131,390,868 137,505,316 18.8 1,904 > ------------------------------- To unsubscribe from the list, please send an email to GENEALOGY-DNA-request@rootsweb.com with the word 'unsubscribe' without the quotes in the subject and the body of the message