If they're more than two ranks below you, you'll lose a TON of points. If they're your rank or just a little bit higher, you'll gain a couple points for winning.
The guy was one rank below me, I'm a S+ and he was a S. So I'm extremely curious as to why I lost 1100 CP from this guy altogether. And you're right even if a defeat a Topaz, I wouldn't get that much. Things like this is why I'm struggling in the damn leaderboards.
I swear both of you would absolutely no problem getting on the leaderboards. I just have to do deal with a lot of bull shit like the fucked up points system, mashers, milaskeyword, ayane being alive, and momiji logic. Its hard for someone trying to get noticed T-T