In Korea, RSP is called "Kawi, Bawi, Bo!" or short "Kai, Bai, Bo!". Students do it in large groups here and go so fast that it is still hard for me to figure out who really won. All I know is one kid usually ends up cheering and excited while another kids hangs their head in resignation.
I doubt I've gone a day at school without hearing a Kai, Bai, Bo tournament going on somewhere and if you are in Korea or visit you should make a tally of how many times you see it. All I know is that it has saved me from many an argument and I think it might be my preferred way to decide who has to do the dishes with Danny now : ) Good luck to you in your many Kai, Bai, Bo games and if you know the "official" Korean rules, let me know because I'm still clueless.