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I suggest making changes to the rules regarding time control.
For example, after 25% of the tournament time (group stage) has passed, points are tallied. Those who haven't played without a valid reason (haven't posted in the forum) receive a technical loss.
The points are added to the table, and we continue.
Then, after 50% of the time, we do the same.
75%.
100% - we tally the points.
This will allow us to control the entire process, especially with a round-robin format in the group stage, where players have a free choice of opponents.
Otherwise, we'll end up with the same problems as before.
P.S. In the last tournament, 27% of the games were not played – it's just awful. I'm not fixated on whether it's a tournament or just for fun, but when players register, then don't play, and the judges don't react in time, it's just depressing.