The introduction of swiss and round robin for tournaments on lichess

Repeated pairings were fixed last week. You can disable berserk in your tournaments.

The arena system is working great for large and small tournaments. Try it.

@thibault @bufferunderrun
I understand the difficulties of organizing Swiss tournaments and Round Robin for large crowds, but have you thought about implementing them exclusively as team events? I mean teams with a small number of members. In these circumstances each team would self-manage their own tournaments.

These tournaments do not have to influence the Glicko rating used by Lichess. Therefore, they would not need moderators or anti-cheat tools either. They would be like gatherings between friends.

Too many people are clamoring for these kinds of tournaments. Ignoring them can backfire for Lichess.

"Vox populi, vox Dei": The voice of the people is the voice of God.

My point is in Arena system even if Berserk can be disable: players than play faster would play more games than slower players, its not a big issue in bullet blitz, but its a huge one in slower time control. at the opposite of Swiss/Robin tournament where everybody play the same amount of games.

@Ugalde thats an interesting ideas

Yes

#22 The same vox populi asking for round robin or swiss will be the first to complain about long waiting times between games, about unfair Buchholz from games against people that quit early, stupid impossibilty to join a few minutes later, the cruel impossibility to take a phone call or go to the restroom...
#23 This is a valid point. The most common mistake beginners make is playing too fast, which causes blunders. Arena rewards playing to fast, not only from berserk, but also bacause more games in a given time = more points.

Greetings @tpr! Thank you for your opinion in the comment #26.

I don't know if you belong to the Lichess development team. So I don't know if you have the power to make a difference. Either way, your point of view is important.

As you can read in my post (#22), you will see that I request this type of tournament (I am interested in Round Robin) exclusively for teams with few members. These users probably know each other personally or on social media and have sufficient means of contact to coordinate an online meeting.

If a dispute arises between the group members, they can solve it face to face, by phone or by WhatsApp.

Furthermore, in my suggestion I propose that these tournaments not be accounted for the Glicko rating. Who's going to complain about a competition that doesn't even affect your score?

The purpose of these mini-events is for groups of friends to go head-to-head in duels until everyone has played against each other to define a simple winner.

These tournaments can last several hours (even days or weeks) because their participants are not interested in exhibiting the result of the competition before the rest of the Lichess community. These tournaments will end when all participants complete the showdown cycle. It's that simple.

Arena is fine for bullet and blitz. Round Robin and Swiss is for players who are fond of slow time controls. It would even be nice to play without a clock.

Forgive my poor English!

#27
No I am not a developer and have no power at all, I just try to contribute with my thoughts.
If you have a small number of participants who agree not to quit after some losses or otherwise, then no one hinders you to stage a round robin tournament yourself. You just send a mail to your participants with the player names and the pairings, white challenges black and you are good to go. Rated or unrated, time control are all as you choose.
Round robin is good for a small number of players commited to not withdrawing.
Arena and Swiss are for large numbers of people.
Swiss needs discipline that you must not withdraw without clearly announcing so to the tournament director.
Swiss also needs waiting time between rounds: pairing cannot be done before all games of a round are finished.
For very large numbers of people like the marathons and in different time zones only arena is viable.

There is something i dont get is why the robin/swiss tournament has being abandonned. Arena were and is a better forma for online chess, but both tournament can be on the website? lets say to make them unrated in the first play to just give it a go.
the only people making theses tournament are small groups of people with additional moderation, it would just give them the tools they need to promot theses tournaments.

You want 5 tournament rounds, than look at the limitations of a swiss.
(Compatible rated opponents vs Alternating, equalising colour allocations)

2¹ players = Immediate result;
2² =2x2 = Max 4 players = Need 2 rounds to discover the winner;
2³ = 2x2x2 = Max 8 players < 3 rounds in your tournament;
2⁴ = 2x2x2x2 = Max 16 players < 4 rounds;
2⁵ = 2x2x2x2x2 = Max 32 players < Minimum 5 rounds;
2⁶ = 2x2x2x2x2x2 = 2⁶ = 64 players < 6 rounds;
2⁷ = 2x2x2x2x2x2x2 = With a maximum of 128 players in your tournament, you will need 7 rounds to discover who is in first place. And even then, you might even need to use a tie breaker.

Arena is a great system. It has things in come to the ladder system, that is not limited to the number of rounds.

I believe swiss only works well when the group is between 17 to 32 players.
Below that number, an organizer should try to use the ladder system, or a round robin elimination system.

Basic swiss rules handbook.fide.com/chapter/C0401

New Dubov System pairings.fide.com/

en.wikipedia.org/wiki/McMahon_system_tournament

en.wikipedia.org/wiki/Ladder_tournament