Just find the official set of rules for chess and chess 960, run a similarity check to see what percentage of them are common and that is the percentage by which chess960 can be considered chess. Personally I don't care, not least because it is off-topic, unless you are talking about Bullet Chess960 which really is insane!
Just find the official set of rules for chess and chess 960, run a similarity check to see what percentage of them are common and that is the percentage by which chess960 can be considered chess. Personally I don't care, not least because it is off-topic, unless you are talking about Bullet Chess960 which really is insane!