The new additions of UEFA, KHL, and tennis scores would seem to indicate that each snippet type is manually built and added by Google.
I would have expected something a little bit broader; an algorithm that attempts to automatically parse score results for all major sports based on the pages they pull results from, or something to that effect. The former is way easier, and probably a whole lot more accurate, that the later, but it removes a little bit of the sex from the whole process. It also highlights how much work must be involved in building the snippet generators for a site like google.
I would have expected something a little bit broader; an algorithm that attempts to automatically parse score results for all major sports based on the pages they pull results from, or something to that effect. The former is way easier, and probably a whole lot more accurate, that the later, but it removes a little bit of the sex from the whole process. It also highlights how much work must be involved in building the snippet generators for a site like google.