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any size · double elimination suggested
Pick a format first. For 4–8 players, double elimination gives everyone at least two matches, which feels better than a five-minute single-elim where someone loses immediately and goes back to their desk. For 12–24 players, single elimination is cleaner and fits in a lunch hour. For groups that want everyone to play everyone, round robin is the format — but it only works well for 6–8 players or a league format over weeks.
Then pick seeding. If nobody knows who's good, random seeding is fine. If there are known players, seed the strong ones across the bracket so they don't meet until later rounds.
Single elimination: one loss and you're out. Finishes fast (log₂ N rounds). Good for big groups, short lunch breaks, or anything time-constrained.
Double elimination: you need to lose twice. Everyone gets at least two matches. Takes roughly 2× as long as single elim. Better for small groups where early losses would feel unfair.
Round robin: everyone plays everyone. Fairest measure of skill but the schedule balloons fast — eight players means 28 matches.