Murphy Chess Club Torny-26
(>1800 range, 48 players, 12 players per group, advance per group: 3 players, concurrent games per opponent: 1, 3 days per move, vacations).
Normally:
A`round: 48 players (= 4 groups X 12 players)---[advance per group: 3 players]=>
B`round: 12 players (= 1 group X 12 players),
but, if more than 3 players per group advance to the next round, due to the same score and tie break, then it will be different.


