ACROPOLIS XXVII tournament
(range >2000, 24 players, 12 players per group, advance per group: 3 players, concurrent games per opponent: 1, 3 days per move, vacations).
Normally:
A`round: 24 players (= 2 groups X 12 players)---[advance per group:3 players]=>
B`round: 6 players (= 1 group X 6 players).
but, if more than 3 players per group advance to the next round, due the same score and tiebreak, then it will be different.