Tournament theory is written as though every participant has a rating: it decides the seeding, it feeds half the tie-breaks, the regulations lean on it throughout. At a club evening, a corporate event or a park tournament nobody has one - and all of that stops working. Here is how to assign numbers, which measures remain usable, what to put in your regulations, and how to keep a beginner from leaving after their second loss.
A rating does exactly two jobs. It arranges the starting numbers so that round one does not pit the two strongest against each other or send a beginner to face a master. And it feeds the handful of tie-breaks computed from opponents' ratings.
Both jobs can be done without it. Worth remembering that a rating is not needed for pairing as such - pairs are built from points - nor for the main coefficients. It affects only the very first round and a couple of rating-based measures at the tail of the list.
The choice depends on whether there are prizes and how mixed the field is. All three are legitimate provided they are announced in advance.
Unrated players get their numbers by surname and are seeded below every rated player. The most common approach in opens and the easiest to justify.
No judgement calls, and the order can be checked by anyone.
In round one the newcomers play each other or the weakest rated players, so the pairing is close to arbitrary.
The organizer asks at registration - experience, an online rating, a national category - and assigns numbers by hand.
Round one becomes meaningful instead of a lottery.
The assessment is subjective and declared strength often differs from real strength. Not advisable at an event with prizes.
Every newcomer is given the same internal rating, which then moves with their results. That is how the Vibe Chess app works.
From the second or third event the pairing becomes meaningful by itself, with no interviews or guesswork.
At the very first event there is still nothing to seed on: every newcomer holds the same starting value.
A practical suggestion: at an event with prizes use the alphabet - it leaves no room to accuse the organizer of favouring anyone. At a friendly evening asking about strength at registration is smarter: round one plays better, and there is nobody to argue with anyway.
The good news: almost all of them. Only two drop out, but they drop out completely.
Computed from the opponents' scores, not their ratings. It needs no rating at all, so it works in an amateur event without qualification.
Also based on the opponents' scores. The primary round-robin measure and perfectly usable in a club setting.
Looks at the game between the tied players. Rating is irrelevant, and it is the easiest measure to explain to a newcomer.
Computed from the player's own results. In beginner events they are often placed above the coefficients precisely because they are easy to follow.
Requires every opponent to have a rating. With half the room unrated the value loses meaning: there is no obvious number to substitute, and each reading produces different placings.
For the same reason: performance is built on the average rating of the opponents. In an event full of newcomers it becomes fiction.
In an amateur event simply leave the rating-based measures out of the list. A working set: Buchholz with the worst result cut, the direct encounter, the number of wins. All three are computed from scores, take a minute to explain and require not a single rating. The full catalogue is in the tie-break reference, and the rating-based ones are covered under average rating of opponents.
The real risk in a mixed-strength event is not the pairing or the tie-breaks: it is half the room going home after two losses. Four things that prevent it.
After two losses a player meets others in the same position, and the third game is usually even. In a knockout they would already be on their way home. For a mixed field that argument settles the format.
A separate «best debutant» category costs little and gives a goal to everybody who is obviously not contending for first. The same trick works with age categories.
Blitz and rapid forgive a gap in class: the game ends quickly, the next one starts at once, and a loss does not consume two hours of the evening. For a first tournament that is markedly more comfortable than classical.
When a player can see themselves moving after each round, the event stops being a sequence of games and becomes a distance. That holds people better than any encouragement.
Formats for a mixed field are worked through in the picker at Swiss or round-robin.
In the Vibe Chess app every player carries a club rating that moves with their results. At the first event it is identical for all newcomers, but by the second or third evening the pairing becomes meaningful without any interviews about strength. Guests without Telegram play on equal terms: the organizer adds them with a single line.
The simplest approach is to place unrated players below all rated ones, ordered alphabetically - that is what most opens do. At a club event you can ask about approximate strength at registration and seed by hand, and if your club keeps an internal rating the question solves itself from the second event onwards.
Everything computed from scores: Buchholz, Sonneborn-Berger, the direct encounter, number of wins, the cumulative score. What does not work is the rating-based pair - average rating of opponents and performance rating - because they need every opponent to have a rating.
Whatever the regulations state: usually zero or a federation minimum. Without such a clause the measure cannot be applied, because the calculation becomes ambiguous. It is simpler not to include rating-based measures in an amateur event at all.
With more than twenty players and a wide spread, yes - it is the best answer. Two sections give newcomers a real contest and strong players meaningful games. Below that size the split rarely pays: each section ends up with eight people and the event becomes too short.
The Swiss system solves half the problem by itself: after two losses a player meets others in the same position and the third game is usually competitive. Beyond that, category prizes - best newcomer, best under a given level - and a live table where personal progress is visible.
An official FIDE or federation rating is calculated only for events submitted for it, and that requires participants to hold identifiers. A club's internal rating is a different matter: you can keep it yourself, and the app does it automatically.
No. Ratings and titles matter for rated and qualifying events; a club, corporate or park tournament is open to anyone. Requiring a rating at an amateur evening would turn away most of the people who wanted to come.
Through points and one measure, not the whole list. «You finished level on points, but Anna's opponents scored more across the event, so she is above you» is understandable to anybody. A full account of the coefficient is neither needed nor helpful.