ACROPOLIS XIX tournament
(range 1600-1800, 96 players, 12 players per group, advance per group: 3 players, concurrent games per opponent: 1, 3 days per move, vacations).
Normally:
A`round: 96 players (= 8 groups X 12 players)---[advance per group:3 players]=>
B`round: 24 players (= 2 groups X 12 players)---[advance per group:3 players]=>
C`round: 6 players (= 1 group X 6 players).
but, if more than 3 players per group go to the next round, due the same score and tie, then it will be different.