chess.com and this site work differently in a few ways.
Correspondence chess is far more popular on chess.com (it is also full of part-time cheats but that's another matter), but they support just 2 forms: regular chess and Fischer Random (chess960), and both have their own set of ratings separate.
On this site, there are different ratings for different speeds of standard chess, but only one for each variant regardless of the speed.
As a result, there is just one chess960 rating and they decided not to include Correspondence as a contributor, and therefore all correspondence games other than standard are unrated.
The positive side is that you can play correspondence chess here in other variants here too, e.g. Crazyhouse, albeit they will be unrated.
Personally I'd like to see each variant also split into the different speed categories, not so much for ratings but when I want to watch games.
chess.com and this site work differently in a few ways.
Correspondence chess is far more popular on chess.com (it is also full of part-time cheats but that's another matter), but they support just 2 forms: regular chess and Fischer Random (chess960), and both have their own set of ratings separate.
On this site, there are different ratings for different speeds of standard chess, but only one for each variant regardless of the speed.
As a result, there is just one chess960 rating and they decided not to include Correspondence as a contributor, and therefore all correspondence games other than standard are unrated.
The positive side is that you can play correspondence chess here in other variants here too, e.g. Crazyhouse, albeit they will be unrated.
Personally I'd like to see each variant also split into the different speed categories, not so much for ratings but when I want to watch games.