Depending on the number of participants the qualifications
are either round-robin or swiss tournamets. 16 players
qualify for the knockout finals.
The thinking time is 9 minutes without byoyomi.
The number of handicap stones depends on the rank difference
D. For D=10..19 it is 2, for D=20..29 it is 3. For the same
number of handicap stones the komi, starting from 6.5, is
lowered by 1 for every additional rank difference.