If two people have 12 of 12 markers that are identical (match exactly), then their most recent common ancestor is less than 14.4 generations back for them 50% of the time or 288 years on average. If two people who participate in the project have 25 of 25 markers that are identical (match exactly), then their most recent common ancestor is less than 7 generations back for them 50% of the time or 140 years on average. Anything less than a 10 out of 12 markers or 23 out of 25 markers between two individuals is not considered a strong match; the two people may be related, but the common ancestor may have been quite a long time ago as you can see in the last column of the table.
The above information can be found at:
It is always best to use a 37 markers, or better yet, 67 markers comparison. Those extra markers can help eliminate individuals who had exact matches with lesser markers.
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