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Swiss tournaments are on Lichess

They show how many rounds they think can be played, based on the number of participants. It's constrained between 2 and your upper limit.
I think the number of rounds increase following the number of players. Edit : too late :)
Thanks so much, Thibault and Lichess Team, for implementing this new fantastic feature!
The feature is great, but for small teams, where there are few participants in a tournament, you can't use the Swiss system well. Round robin tournaments would be good here.

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