Not long ago, the group stage at a big esports event meant a few groups of four teams, a round robin, top two advance. Today, many of the biggest tournaments use a Swiss stage instead: CS2 Majors, the League of Legends World Championship, and Valorant Masters have all used it. If you've seen a team "go 3–0" or "squeak through at 3–2", this is what it means.
The basic idea
The Swiss system comes from chess. Its idea is simple: in each round, you play a team with the same record as you.
In esports, the usual version has 16 teams and works like this:
- In round one, teams are paired up (often by seeding).
- After round one, there are eight teams at 1–0 and eight at 0–1. The 1–0 teams play each other, and so do the 0–1 teams.
- This continues. Teams that reach three wins advance. Teams that reach three losses are eliminated.
- After at most five rounds, every team has either three wins or three losses.
Eight teams advance and eight go home. Along the way, the bracket sorts itself into groups by record:
| After round | Records |
|---|---|
| 1 | 1–0, 0–1 |
| 2 | 2–0, 1–1, 0–2 |
| 3 | 3–0 (advance), 2–1, 1–2, 0–3 (out) |
| 4 | 3–1 (advance), 2–2, 1–3 (out) |
| 5 | 3–2 (advance), 2–3 (out) |
That's why commentators talk about "the 2–2 pool" or "the 1–1 matches". Each of those is a mini-tournament of teams in the same situation.
Why organisers like it
Fewer meaningless matches. In a round-robin group, the last day often has matches where nothing is at stake. In Swiss, every team is either playing to advance, playing to survive, or both.
Strong teams meet each other. Because unbeaten teams play unbeaten teams, the best sides tend to meet early, rather than after a series of easy wins against weaker groups.
It handles big fields well. You can run 16 teams through a stage in five rounds, which is hard to do fairly with groups.
Best-of-one vs best-of-three
Many Swiss stages mix formats. Early rounds are often best-of-one to keep the schedule short, and matches where a team can advance or be eliminated are best-of-three. That's the setup used at recent CS2 Majors in the first two stages and at recent Worlds Swiss stages. It's a compromise: fast early rounds, but no team goes home on a single map.
At the IEM Cologne Major in June 2026, Valve took it further. The third Swiss stage used best-of-three for every match.
How pairings are decided
Inside each record group, someone has to decide who plays whom. Events do it differently:
- Seeding. Higher seeds are paired with lower seeds in the same group, so the top teams don't meet each other in the first rounds.
- Buchholz. CS2 Majors use a version of the Buchholz system from chess. Each team gets a difficulty score based on how its opponents have done so far. Teams that have faced harder opponents are paired with teams that have had an easier path. The idea is to even out everyone's schedule.
- Draws with restrictions. Some events draw pairings at random within each record group, with rules to stop teams meeting again.
What the records tell you
- 3–0 is a dominant run. These teams usually get an easier seed in the next stage or playoffs.
- 3–1 is a solid run with one slip.
- 3–2 means a team survived two elimination matches. Sometimes that's a sign of weakness, sometimes of resilience. Teams that come through 3–2 have won tournaments before.
- 0–3 usually means a team simply wasn't at the level of the event.
The criticism
Swiss isn't perfect. Because pairings depend on results, two teams can reach 3–1 with very different schedules, one having beaten top seeds and the other having had an easy path. Buchholz tries to fix this, but it can't remove it completely. And best-of-one rounds always bring a bit of luck: one bad map can send a strong team down into the elimination matches.
Still, for big fields and high stakes, it's the best format organisers have found. Next time you watch a Swiss stage, look at the record pools, not just the scores. That's where the drama is.
Follow live matches on the Esports page. League's World Championship starts its Swiss stage on October 23, and the League of Legends hub has the latest news.