I've discovered two more GP modes:
https://mirror.codeforces.com/contests/2147,2164,2180,2179/gp10/best4/standings?mobile=false
https://mirror.codeforces.com/contests/2147,2164,2180,2179/gp30/best4/standings?mobile=false
https://mirror.codeforces.com/contests/2147,2164,2180,2179/gp100/best4/standings?mobile=false



