1.2.6 introduced 3P automatching. However I didn't really have an idea what to do with the default rating requirements. My guess is the 3P ratings haven't really settled, because there weren't that many 3P games getting played, mostly because there wasn't any 3P matching before today.
So for now I just copied the restrictions from 2P (which means searching from -10 to +10), but quite possibly that makes it too hard to find a match and I need to double that range next week.