30-Player Chess Tournament and Up: when you can't do it without software
How many rounds for a big field
For 30-40 people you use 6-7 rounds, for 65-128 - 8-9. With thirty players seven rounds reliably reveals a winner from a large field and gives a sensible final table with places by Buchholz.
The round count grows slowly (like the binary logarithm), so even a hundred people play just 8-9 rounds - see how many rounds in the Swiss. That's the key advantage of the Swiss system for mass tournaments.
Why you can't do it by hand anymore
With 30 players, hand pairing becomes a profession of its own: each round you must form 15 pairs so nobody plays the same opponent twice, keep the color alternation and miss no one. Plus, after each round, recompute points and Buchholz for all thirty.
One mistake and the table is wrong and places unfair. That's why big tournaments are always run with software. The Vibe Chess bot does all this instantly, which is what lets one organizer run a whole festival.
Timing and a festival plan
On rapid 10+5 a round takes 25-30 minutes, seven rounds a big competition day (4-5 hours with breaks). For a faster event take blitz. You need 15 boards and, ideally, clocks - free phone clockswork. It's all run from the bot @vibechessbot: /create_tournament, /open_registration, /start_tournament and /next_round - see the organizer guide.
Run a mass tournament with one organizer
Frequently asked questions
How many rounds do I need for 30 players?
Six or seven Swiss rounds. That's enough to reliably reveal a winner from a large field and build a sensible final table with places by the Buchholz coefficient.
Can I run a 30-player tournament by hand?
Practically no. Each round is 15 pairs with match history and colors, plus Buchholz for everyone. One mistake breaks the table. So mass tournaments are always run with software - the bot does it instantly.
How long will it take?
On rapid 10+5, seven rounds is a big competition day, 4-5 hours with breaks. Blitz halves the time. All games in a round run in parallel, so the length is set by the time control.
How many boards do I need?
Fifteen - one per pair. Clocks are desirable for fair timing: free phone clocks work, one per table.
What if there are 50 or 100 players?
The bot handles it: 65-128 people use 8-9 rounds. The round count grows slowly, so even a hundred players finish in one day. The pairing stays correct at any scale.
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 - 20-player tournament. About the round count - how many rounds in the Swiss. A day format - weekend rapid tournament. Full mechanics - organizer guide.