Questions tagged [swiss-pairing]

For questions about the Swiss Pairing method which is used in some (open) tournaments to determine who plays against whom.

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Pairing Preference in Swiss Tournament System

Suppose we have 10 players A, B, C, D, E, F, G, H, I, J (sorted by their ranks). First-round pairs are A - F, B - G, C - H, D - I, E - J and players A, B, C, D, E win their matches. What should be the ...
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6 votes
4 answers
758 views

Is there a tournament system that pairs players based on ratings being similar?

Clearly games are more fun when the result can't be predicted in advance hence pairing players who have not recently played each other and have similar ratings has advantages. After a few games it ...
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2 votes
1 answer
66 views

Record Swiss top tie

In a current German championship, a whopping 11 players currently have 5/6. The fact that 197 players are listed makes this a bit less remarkable, of course. Obviously, the probability p of such an ...
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3 votes
2 answers
233 views

How can I use JaVaFo in my pairing program?

JaVaFo is the official pairing engine for certifying implementations of the Dutch pairing algorithm for Swiss tournaments. When I look at FIDE's list of endorsed pairing programs I see that most of ...
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0 votes
2 answers
95 views

Why do receive higher ranked players a downfloat in fide swiss pairing?

I am trying to grok the fide specification of the swiss pairing algorithm, having a hard time with that. For example rule A.4.b reads: A4 [...] b After two players with different scores have played ...
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-1 votes
1 answer
218 views

A Swiss nightmare

Inspired by a recent question, here a fantasy: The Superduperquantumcomputer "Deep Ponder" has cracked Chess. Assume a 9 round Swiss tournament with 2^9 players, White always wins. Will the ...
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5 votes
1 answer
399 views

Which pairing programs have been authorized by FIDE for use in FIDE rated tournaments?

There are lots of questions about pairing programs here, some of them mention being authorized by FIDE, but how can I check and know which programs are currently authorized?
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2 votes
1 answer
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How does the JaVaFo engine work and how random are the pairings?

In most official FIDE tournaments, the JaVaFo engine is used to pair the players according to some FIDE-defined rules. What are those rules and how random are the pairings (i.e. can I reproduce them ...
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10 votes
2 answers
613 views

How can I know if the chief arbiter has "cheated" in the pairings and possibly report it?

Few years ago, I participated in a local, FIDE-rated tournament. In its first round, the chief arbiter paired the players 4 times (yes, I saw the 4 different pairings and changed four opponents before ...
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  • 3,433
2 votes
1 answer
201 views

Swiss system pairing algorithm stuck

I'm building a Swiss System algorithm and have the following scenario. 10 participants. 8 rounds are to be played. Generating round 8, I have three players that haven't played each other. These three ...
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1 vote
0 answers
148 views

VinczeSwiss - the new FREEWARE program for swiss pairing - help me please with the translation [closed]

all. My name is Roman Vincze. I play chess (https://ratings.fide.com/profile/324906) and I'm also a programmer. As for tournaments with swiss system, all computer programs are paid. That's why I ...
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7 votes
2 answers
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How is Buchholz score calculated in a Swiss tournament?

I would like to know how the Buchholz tiebreak system works, and how it is calculated, taking into consideration other factors such as bye, no show (default win), etc.
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2 votes
1 answer
166 views

Predicting color and opponent

Is there any way to predict, with some certainty, my next opponent and color for next round in a swiss tournement on chess-result: http://chess-results.com/tnr406767.aspx?lan=1
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1 vote
2 answers
205 views

In what way is it allowed to alter tournament pairings in favor of a player?

The FIDE Rules for Swiss Systems state: C.04.2 A It is not allowed to alter the correct pairings in favour of any player. and then further state: Where it can be shown that modifications of ...
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3 votes
2 answers
2k views

How do I determine the bye player in a Swiss tournament?

The FIDE basic rules for Swiss systems mention: (c) Should the number of players to be paired be odd, one player is unpaired. This player receives a pairing-allocated bye: no opponent, no colour and ...
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0 votes
1 answer
65 views

Multiple teams from the same country in Swiss system

Doesn't it create bias for the country? Disclaimer: I realize that benefits of having more teams from the same country far outweigh possible drawbacks, just trying to reason how possibly "unfair" can ...
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2 votes
2 answers
4k views

Swiss Pairing Algorithm

I am building a simple Android application for hosting Chess tournaments, I am having some difficulty implementing a Swiss paring algorithm, I need link to an article or a paper that explains how I ...
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  • 517
4 votes
3 answers
809 views

Swiss-pairing algorithm

Is there a (simple) algorithm for setting up a swiss tournament? I've searched around a little, but can't find anything specific. Alternatively, is there any good and free software available for ...
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-3 votes
1 answer
318 views

Swiss system chess tournament

In a swiss system chess tournament, how long should a round last? If a player exceeds his time who will be the winner?
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0 votes
3 answers
884 views

Why can't FIDE use a Non-Deterministic Gender Neutral Swiss Pairing system?

I have been following the controversy surrounding the pairings of Hou Yifan at the IOM chess tournament 2017. She was paired with 4 consecutive female players, this is following her last open swiss ...
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1 vote
1 answer
611 views

Difference between Swiss Manager Light and Full version?

I just realized that there are two versions of Swiss Manager. Does anyone know the difference?
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  • 1,745
3 votes
1 answer
650 views

Chess pairing program for double round robin

We have regular friendly matches in our chess club. So far we have used an older version of swiss manager for swiss and round robin; but today when we had to pair using double round robin format, I ...
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  • 1,745
2 votes
4 answers
835 views

Swiss pairing parameters

I realize that there are various types of Swiss pairing systems. What would be a minimum set of parameters that needs to be specified in order to avoid ambiguity in pairings? I am thinking of ...
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3 votes
1 answer
188 views

Intervening with swiss pairing

In connection with the Hou Yifan incident in Gibraltar I read that when doing the pairings they avoided matches between players from Iran and Israel (for whatever reason...). How is this technically ...
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7 votes
6 answers
17k views

Looking for online Swiss pairing software

I would appreciate if somebody could recommend a good Swiss pairing program. I'd prefer online version with multi-language option and free version but cheap one is also good. I've found http://www....
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