To determine the European Super Smash Bros. Ultimate champions in Amsterdam, qualified teams will be split into 4 groups of 3 teams, with the top 2 teams of each group moving on to the quarter-finals stage.
The winners in group, quarter- and semi-finals will be decided by a best-of-five set, featuring these matches:
Match 1: 2v2
Match 2: 1v1 Smashdown
Match 3: 1v1 Smashdown*
Match 4: 1v1 Smashdown*
Match 5: 3v3 Squad Strike
*Characters picked in previous rounds of Smashdown will not be available
All 3 members of each team must participate in at least one of the first 3 matches of the Set. In the Grand Final, matches 1 – 4 will be best of three.
For full details on the ruleset, please refer :
https://www.nintendo.co.uk/Games/Nintendo-Switch/Super-Smash-Bros-Ultimate-1395713.html#Events