Remember that the One-to-Many comparison is based on whatever the "batch process" has determined are the matching segments for all combinations of every kit in the database, while the One-to-One comparison does a real-time comparison of the tokenized SNP data for the two kits you specify.  It is entirely possible that the "batch process" used a different algorithm version than whatever is currently being used in the One-to-One comparison.  For that matter, the "tokenization" process that encodes the SNP's in the raw DNA data file may have had different versions as well. However, have a look at the DNA File Diagnostic Utility on Genesis!  It is clear that "migrated" kits have indeed been put through a new "batch process", as well as a "slimming" process (apparently reducing the number of SNP's by around 30% at least for some kits?). Given that Genesis is still nominally a development site, I think we should expect the results to vary from time to time.  The advice from the "normal" GEDmatch site still applies, however:  Always "verify" matches you find on the One-to-Many report by running the One-to-One comparison tool! John McCoy(RealMac@aol.com) In a message dated 12/22/2018 3:15:55 PM Pacific Standard Time, orcop1986@gmail.com writes: Ian, I have the same problem, ie one to many giving a different result thanone to one. I've written Curtis, but as yet no reply.John _______________________________________________Email preferences: http://bit.ly/rootswebprefUnsubscribe https://lists.rootsweb.com/postorius/lists/genealogy-dna@rootsweb.comPrivacy Statement: https://ancstry.me/2JWBOdY Terms and Conditions: https://ancstry.me/2HDBym9Rootsweb Blog: http://rootsweb.blogRootsWeb is funded and supported by Ancestry.com and our loyal RootsWeb community