Group Stage

For group stage:

• The round robin group stage must have an even number of participants: F(X)=2X

• Similar to the recent football World Cup group stage setting, each player will meet against all other players in the same group.

• For the matchmaking algorithm, the round robin uses the circle method* where N is the number of competitors

For more clarity: https://en.wikipedia.org/wiki/Round-robin_tournament#Circle_method