OK. I can agree that different algorithms will produce different results but I'm still wondering why if FTDNA shows results that are sometimes in the 2-3 cM range at 500-700 SNPs, that there would be that much difference in results. It makes me wonder whose results can I believe? Should I take the conservative approach and not believe results unless both sites report the same? ISOGG says a match over 5cM is required in order to be considered IBD. I would like to assume that the match I have on gedmatch of 8.2 cM at 974 SNPs is a probable match even though FTDNA shows absolutely nothing on that same chromosome.
-Carl