I think there can be another approach. Popularity is a questionable criterion in most cases because people tend to play what they were given by a search engine, the inventor's activity to promote a CV or his initial popularity like in the case of Chess960. Chess in its structure is closer to a formal science, so, the function here prevails over the form, and it would be a valid point to explore the less showcased specturm of the medium which can provide the reader with an efficient or original idea. By saying that I mean this as another possible approach, that does not exclude others.
There are plenty of hidden gems on this site, some of whom didn't even get a single comment, it would be better in my opinion to promote them for further discussion instead of established CVs.
Among relatively known ones, I personally would vote for Modern Chess and Singularity Chess.
I think there can be another approach. Popularity is a questionable criterion in most cases because people tend to play what they were given by a search engine, the inventor's activity to promote a CV or his initial popularity like in the case of Chess960. Chess in its structure is closer to a formal science, so, the function here prevails over the form, and it would be a valid point to explore the less showcased specturm of the medium which can provide the reader with an efficient or original idea. By saying that I mean this as another possible approach, that does not exclude others. There are plenty of hidden gems on this site, some of whom didn't even get a single comment, it would be better in my opinion to promote them for further discussion instead of established CVs.
Among relatively known ones, I personally would vote for Modern Chess and Singularity Chess.