In a Round Robin bracket, players or teams are separated into groups by the tournament organizer. Everyone in the same group plays each other once. As a result, the only decision you need to make is which participants to put into which groups.
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Watch this short video tutorial on Round Robin Brackets
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*Currently, Classic Double Round Robin Brackets are not possible through the platform; but organizers can set up as many games to be played as they want for a given matchup by using the # number of games option, achieving a similar result.