12-Player Chess Tournament: 5 rounds in one evening
How many rounds and why 5
For 12 players, 5 Swiss roundsis optimal. That's enough for the leaders to meet a few times and a single winner to emerge, with places on equal points settled by the Buchholz coefficient.
A round-robin (everyone plays everyone) for 12 isn't used - it's 11 rounds and a whole day of play. The Swiss gives the same excitement four times faster. More on picking the round count in the how many rounds in the Swiss article.
Timing for an evening
On blitz 5+0 a round takes 12-15 minutes with seating (6 games run in parallel). Five rounds is about 1.5 hours. Blitz 3+2 wraps it in an hour; rapid 10+5 stretches it to 2.5-3 hours for more thoughtful games. For 12 people you need 6 boards - one per pair.
A ready plan for an office or friends
A classic scenario: 12 coworkers, a Friday evening, blitz 5+0, 5 rounds, a prize for the winner. Create the tournament in the bot @vibechessbot with /create_tournament, open /open_registration (people sign up themselves), /start_tournament and /next_round between rounds. The finished table comes after /finish_tournament. More on the office format in the office tournament article.
Run a 12-player tournament in one evening
Frequently asked questions
How many rounds do I need for 12 players?
Five Swiss rounds. That's enough for the leaders to meet and a single winner to emerge, with equal points broken by the Buchholz coefficient.
Why not round-robin?
A round-robin for 12 is 11 rounds - a whole day of play. The Swiss gives the same result in 5 rounds, so for this size it's the one to use.
How long will the tournament take?
On blitz 5+0, about 1.5 hours (five rounds of 12-15 minutes). Blitz 3+2 - around an hour, rapid 10+5 - 2.5-3 hours, depending on how thoughtful you want the games.
How many boards do I need?
Six - one per each of the 6 parallel games. With fewer, play in turns, but the tournament takes longer.
What if 11 or 13 show up?
No problem: on an odd count the bot gives one player a BYE with a point each round. The 5-round plan stays the same.
Missing a feature? Message the developers
The bot is constantly improved based on real tournaments. If you need a feature that isn't there yet, message the developers right inside the bot with the /support command. Many features appeared exactly because organizers asked for them, and useful ideas get added quickly.
What to read next
A smaller group - 8-player tournament. A bigger one - 16-player tournament. The format - blitz in an evening. At the office - office tournament.