75 % of all points to pass the course (extra points and extra round excluded). The grade assignment was done roughly as follows (with some rounding):
10 % -> 1
20 % -> 2
40 % -> 3
20 % -> 4
10 % -> 5
I told originally that extra round is mandatory for the best grade. I decided to relax this a bit to set a more reasonable limit for the best grade.
