ladder software for clubs?

[sybob]

I've found that tournament software like McMahon (by Christoph Gerlach) is actually quite suitable for this.

Indeed, but I was hoping there would be something better, a bit more practical.
In fact, there is. We can now use an excellent spreadsheet in Excel, but dedicated software would even be better.

[sybob]

This is a good, free software way to get a "ranking" of the players in the club but does it allow a function which club ladders I am familiar with have, namely the challenge feature. The way that works is a member challenges another member to a ladder game and if the lower ranked player defeats the higher rated player the players switch places on the ladder.

I think clubs use a wide variety of laddering methods.

[Kirby]

Would WHR work for this?

[Harleqin]

This kind of ladder is really trivial to manage. You can use a static HTML page and update by hand.

[sybob]

This kind of ladder is really trivial to manage.

In a sense, you may be right. Everything's easy if you already know it.
We want a 'official' ladder, based on EGF requirements, GoR, rank, winprobability, relative con, and automatic computation of new GoR. It also should adjust for handicap and varying komi.
Perhaps I should have specified that before.
Not everyone/everything can handle that.
Just showing the output on a webpage is indeed simple.

[sybob]

Would WHR work for this?

What is WHR?

[Harleqin]

This kind of ladder is really trivial to manage.

In a sense, you may be right. Everything's easy if you already know it.
We want a 'official' ladder, based on EGF requirements, GoR, rank, winprobability, relative con, and automatic computation of new GoR. It also should adjust for handicap and varying komi.
Perhaps I should have specified that before.
Not everyone/everything can handle that.
Just showing the output on a webpage is indeed simple.

OK, then I don't understand what you want. I read it as a “challenge to get the place” ladder (or did I miss who posted what?). That would have nothing to do with ratings at all.

[Kirby]

Would WHR work for this?

What is WHR?

Whole history rating: https://www.remi-coulom.fr/WHR/WHR.pdf

I believe it's what goratings.org uses to generate ratings and orderings for pro players, based on the games they play.

[gennan]

So you want to maintain some kind of club rating list?

In the Dutch go clubs where I played in the past we also called that a ladder.

We used a very simple system where everybody's rating is tracked as "classes" (an old German rating system). Each rank is divided in 2 classes, the higher the rank, the lower the class. "weak" 1d would be class 19, "strong" 1k would be class 20. From the class difference we'd compute the handicap in komi sized steps. 1 class difference = no komi. 2 classes difference = 2 stones handicap with komi for white. 3 classes difference = 2 stones handicap without komi, etc. For each win, your class goes down by 1 step and for each loss your class goes up by 1 step. So all the updating is very simple and easy to do without a computer. This system also predates the time where everbody has a computer.

You can run this kind of system indefinitely. It works well to settle on correct handicaps between club members and thus everybody can establish their ranks relative to the stronger players of the club (who serve as an anchor, as they probably have the most established national ranks).

Over time, the ladder can drift up or down (when some players improve or decline a lot), so every once in a while you recalibrate by shifting the ladder in such a way that the avarage class of the strongest players in the club matches the average of their "official" ranks again.

There are also clubs who use software to maintain club ratings and generate club competition pairings. But someone will have to do some work (like entering all the results, keeping track of who will play in a next round etcetera). I know the club in Eindhoven has such a system and I expect that they will give you a copy when you ask them. I'm not sure how closely their rating calculation matches the EGF system though.

[vash3g]

Its not a ladder system but we had a club member write a round robin system for our club once. This forked into the system that the aga uses for its larger live tournament standings/crosstabs like the USGC. Its php, js, and mysql based. Uses eidogo to display the loaded sgf files to view the results. It helped our club when it was more active and we had some strong local players who would review the games. I wish i still had a screenshot of the old system but we had issues with our hosting at one point.

https://github.com/usgo/goleague