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In a Swiss format tournament (also called the Swiss system), nobody gets knocked out. Everyone plays every round, and each round you face someone with the same record as you, or close to it, and never the same opponent twice. After a set number of rounds, the player with the most points wins, and tiebreakers settle any ties.
Below we walk through how Swiss pairings work with an 8-player Magic example, round by round. We also cover odd numbers of players, how many rounds to play, what "X-1" means and how Swiss compares to round robin.
What is the Swiss format?
The Swiss format is a tournament structure where players are paired each round against opponents with similar records, no one is eliminated, and the final ranking comes from total points after a fixed number of rounds. It sorts a big field into a fair ranking in far fewer rounds than having everyone play everyone.
Every Swiss tournament follows four rules:
The number of rounds is fixed before the event starts.
Players are paired by record: winners play winners, and players who lost play each other.
You never face the same opponent twice.
Final standings go by points, then by tiebreakers.
Why is it called Swiss?
The system was first used at a chess tournament in Zürich, Switzerland, in 1895 (Wikipedia). Chess kept it for open tournaments, and the name stuck as the format spread to other games, Magic included.
How Swiss pairings work
Round one is random. After a booster draft, some groups pair round one by draft seat instead, which works just as well.
From round two on, you sort players into groups by points (score groups) and pair players inside each group, skipping anyone they've already played. If a group has an odd number of players, one of them gets paired against someone from the next group down.
Magic scores with match points: 3 for a win, 1 for a draw and 0 for a loss (MTR Appendix C). Chess scores 1, ½ and 0, but the pairing logic is the same.
Worked example: 8 players, 3 rounds of Swiss
Eight players, no draws. Here's how the records split after each round:
| After round | Records |
|---|---|
| Round 1 | four players at 1-0, four at 0-1 |
| Round 2 | two at 2-0, four at 1-1, two at 0-2 |
| Round 3 | one at 3-0, three at 2-1, three at 1-2, one at 0-3 |
Each round halves the score groups. In round two, the four 1-0 players play each other, and so do the four 0-1 players. In round three, the two 2-0 players meet for the only undefeated spot, the four 1-1 players are paired among themselves, and the two 0-2 players play each other.
After three rounds, exactly one player is undefeated. That's how 3 rounds play out after a booster draft, and it's the structure we recommend in our MTG draft rules guide.
What about draws?
A draw gives both players 1 point and breaks the neat halving. Magic records are written wins-losses-draws, so one win, one loss and one draw is 1-1-1 with 4 points. A single draw in round two of the example leaves two players on 4 points who fit neither the 2-0 nor the 1-1 group, so someone gets paired up or down. Draws are one more reason Swiss needs tiebreakers.
There's no bracket in Swiss
A single elimination bracket shows who's still alive. Swiss doesn't need one, because everyone stays in: the standings table does the job. When esports sites draw a "Swiss bracket", it's really a grid of records (2-0, 1-1, 0-2) showing which group each team is in.
Odd number of players? How byes work
With an odd number of players, one player sits out each round and gets a bye. The common way to hand them out at casual Magic events:
In round one, the bye goes to a random player.
In later rounds, it goes to the lowest-ranked player who hasn't had a bye yet.
Nobody gets two byes.
A bye counts as a match win: 3 match points, scored as a 2-0 win (MTR Appendix C).
Worked example: 7 players, 3 rounds
Seven players, A to G. In each match, the first player listed wins.
| Round | Pairings | Bye | Records after the round |
|---|---|---|---|
| 1 | A vs B, C vs D, E vs F | G (random) | A, C, E, G 1-0. B, D, F 0-1 |
| 2 | A vs C, G vs E, B vs D | F (lowest-ranked 0-1 without a bye) | A, G 2-0. B, C, E, F 1-1. D 0-2 |
| 3 | A vs G, C vs E, B vs F | D (lowest-ranked, no bye yet) | A 3-0. B, C, G 2-1. D, E, F 1-2 |
Three different players got a bye, nobody got two, and nobody played the same opponent twice. Because the bye counts as a win, nobody finished 0-3 either.
Byes also change tiebreakers. A bye isn't an opponent, so it's left out of your OMW%. We explain how that works in Magic tiebreakers explained.
How many rounds of Swiss should you play?
The rule of thumb: play as many rounds as it takes to halve the field down to one player. In math terms, that's log₂ of the player count, rounded up. Eight players halve to 4, then 2, then 1, so 8 players need 3 rounds to leave one undefeated player.
| Players | Swiss rounds | Usual top cut |
|---|---|---|
| 4 | 2 (or a 3-round round robin on paper) | None |
| 5-8 | 3 | None |
| 9-16 | 4 | Optional top 4 or top 8 |
| 17-32 | 5 | Top 8 |
| 33-64 | 6 | Top 8 |
So 16 players play 4 rounds of Swiss, and 32 players play 5.
A note for rules nerds: the Magic Tournament Rules (Appendix E) set the rounds for competitive events, and they differ at the small end. They call for straight single elimination with 5 to 8 players. With 9 to 16, they ask for 5 rounds and a top 4 in most formats, or 4 rounds when the top 8 is a booster draft. On a casual night, Swiss keeps everyone playing every round, and the numbers above fit an evening.
If you're planning the whole night, from the space to the snacks, see our guide on how to host a Magic tournament at home.
What X-1 means (and how a top cut works)
Magic players describe records by losses, whatever the round count:
X-0 is undefeated, X-1 is one loss and X-2 is two losses. So "X-1" means 4-1 after five rounds or 5-1 after six, and players use it to talk about who's still in contention for the top cut.
A top cut is a single elimination playoff after Swiss. The top 4, 8 or 16 players in the standings play it out, with 1st facing the lowest seed, 2nd facing the second-lowest and so on. MTGevent runs Swiss with a top 4, 8 or 16 cut.
The saying "X-1 makes top 8" comes from the math. Take 32 players, 5 rounds and no draws. After Swiss you get one 5-0, five 4-1s and ten 3-2s. All six X-0 and X-1 players make the top 8, and tiebreakers decide which two of the ten 3-2 players fill the last spots. Draws and drops shift those numbers at a real event.
How the winner is decided: points, then tiebreakers
Points come first. In Magic, players on the same points are ranked by three tiebreakers, in this order:
OMW%: your opponents' average match-win percentage
GW%: your own game-win percentage
OGW%: your opponents' average game-win percentage
The idea is strength of schedule: if two players are both 2-1, the one who beat tougher opponents ranks higher. Chess uses tiebreakers such as Buchholz and Sonneborn-Berger, which measure the same thing. The full math, including the 33% floor, is in our article Magic tiebreakers explained.
Swiss vs round robin vs single elimination
| Swiss | Round robin | Single elimination | |
|---|---|---|---|
| Who plays whom | Players with similar records | Everyone plays everyone | Winners advance, losers are out |
| Rounds needed (N players) | About log₂ N (3 for 8 players) | N − 1 (7 for 8 players) | log₂ N (3 for 8 players) |
| Anyone knocked out? | No | No | Yes, half the field each round |
| Best for | 5 or more players in an evening | 3 to 5 players with time to spare | A playoff, or when time is short |
With 4 players, 3 rounds of Swiss with no rematches is a round robin. After two rounds, each player has exactly one opponent left. That's why the rounds table says 2 rounds of Swiss, or the full 3-round round robin on paper.
Round robin gets long fast: 6 players need 5 rounds, and 8 need 7. Single elimination is quick, but half the table is done after one match.
So which is better? Swiss, when you have more players than you have time for rounds. Round robin is fairer when you can fit N − 1 rounds into the evening, because everyone plays the same opponents.
Swiss in other games: chess, esports and football
Chess uses Swiss for most open tournaments, with 1 point for a win, ½ for a draw and 0 for a loss. Chess pairings also balance who gets the white pieces, a rule card games don't need.
Esports events often run a "Swiss stage" with early exits. At Counter-Strike Majors, for example, teams play others on the same record until they reach 3 wins and advance, or 3 losses and go home (esports.gg). In football, the UEFA Champions League switched to a "Swiss model" league phase in the 2024-25 season: 36 clubs, each playing 8 different opponents, ranked in one table (Sports Illustrated). Unlike true Swiss, the opponents are drawn before the season instead of being paired by record each round.
Magic and other trading card games use classic Swiss: a fixed number of rounds, everyone plays them all, and match points decide the standings.
Running a Swiss tournament without the spreadsheet
Running Swiss on paper is fine for round one. From round two you're tracking records, past opponents and who had the bye, then working out tiebreakers, all while players wait for pairings.
We built MTGevent to take that over, with free Swiss pairings for Magic that run in the browser, so nobody installs anything. It:
suggests the number of rounds from the player count, using the numbers in the table above (you can change it)
pairs every round, avoids rematches and assigns byes automatically
keeps live standings with match points, OMW%, GW% and OGW%
runs Swiss with a top 4, 8 or 16 cut, or single elimination
lets players join by QR code or link and report their own results from their phones
For more on how the pairings work, see our MTG pairings generator page. One limit to know about: we don't offer round robin as a separate structure, so with 4 players, run it as Swiss.
FAQ
What does 3 rounds of Swiss mean?
Everyone plays 3 matches, each against someone with a similar record. Nobody is knocked out, and the best record after 3 rounds wins. It's the usual length for 5 to 8 players, like a booster draft pod.
Is Swiss better than round robin?
Swiss is better when you have more players than rounds, because everyone plays the same number of matches and the standings still sort out fairly. Round robin is fairer when you can afford N − 1 rounds, which usually means 3 to 5 players.
How many Swiss rounds for 16 players?
Four rounds. That leaves one undefeated player and four at 3-1. Competitive Magic events under the MTR use 5 rounds and a top 4 for most formats with 9 to 16 players.
How many Swiss rounds for 32 players?
Five rounds, usually followed by a top 8 single elimination playoff.
Why is it called the Swiss system?
It was first used at a chess tournament in Zürich, Switzerland, in 1895.
What happens if you have an odd number of players in a Swiss tournament?
One player gets a bye each round. The usual rule is a random bye in round one, then the lowest-ranked player who hasn't had one yet. Nobody gets two, and a bye counts as a win: 3 match points in Magic.
Can you play the same opponent twice in Swiss?
No. Swiss pairings avoid rematches. The only exception is a tiny field with more rounds than it can handle, such as 4 players playing a fourth round, because by then everyone has already played everyone.
What does X-1 mean?
A record with exactly one loss, whatever the number of rounds. In a 5-round event, X-1 is 4-1.
Run your next Swiss event without pen and paper
Pairings, byes and tiebreakers are what slow down a Swiss night, and they're the parts we built MTGevent to handle. It's free for up to 8 players, runs in the browser and lets players join by QR code. For bigger events, Pro covers unlimited players for $9.99/month.
MTGevent.com is not affiliated with Wizards of the Coast in any way. Magic: The Gathering is a trademark of Wizards of the Coast LLC.