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Ideally, it would be best not to bother with the brackets and have the captains play a best-of-three match.
Regarding the brackets, strangely enough, even though some people are missing, all the brackets are in place.
And all 18 games, 6 times (in six brackets), with 3 games in the final, have been played. The score is 9:9. Nothing prevents us from also crossing out these brackets as Vickk wrote.
("There is no need to automatically cross anything out; we already went through that before the final.")
But once again, in my opinion, nothing needs to be crossed out.
When the Regulations were written, the situation was considered theoretically, but now we are seeing it in practice.
And in practice, the simplest and fairest option is for the strongest players on the teams (i.e., the captains) to play a best-of-three match.
If not, then as Vickk wrote, cross it out.
Note: Lucky hasn't read anything yet and hasn't expressed his opinion. :)