# Thread: How does the Rating System work?

1. ## How does the Rating System work?

Hi everyone. Just wondering, how does the ratings system work? How do they calculate the ratings? I was looking at the results on Ian Rout's site to find out where I came and it said i was going up 32.3 points (or something like that). How is it worked out? How do they know how many points I am going up?

Sorry, I'll stop now, too many questions at the one time

2. Ian would have to verify but I assume that is an estimate based on the Elo system with a particular weighting (k) factor. The ACF rating system is not an Elo system so I would takes Ian's figures are broadly indicative estimates only.

For more information of the working of Glicko check out Prof Glickman's glicko webpage.

http://math.bu.edu/people/mg/glicko/index.html

3. Originally Posted by Rincewind
Ian would have to verify but I assume that is an estimate based on the Elo system with a particular weighting (k) factor. The ACF rating system is not an Elo system so I would takes Ian's figures are broadly indicative estimates only.

For more information of the working of Glicko check out Prof Glickman's glicko webpage.

http://math.bu.edu/people/mg/glicko/index.html
Before clicking on the link that had math-blahblah-edu-blahblah I suspected this would not help much. Subsequent to clicking on it my suspicion was confirmed.

4. Well it has been a few years since I wrote this but perhaps this is of some use...

Glicko Article

Also there is a spreadsheet to perform calculations

Unfortunately the webiste is currently non-operational in its full form, but the links above should work.

5. How does the rating system work?

Well there are 3 schools of thought .

B]Mysteriously

C]Effeciently.

Most people seem to agree its a combination of A and B.

6. Sorry RW, but Alana, who is about 11, asked for a simple explaination of how the rating system works. Providing a link to a professor's website to explain how the rating system works in intricate detail probably didnt help much at all.

I think Alana just wanted a simple explaination.

7. ## The formula is shrouded in mystery...

Originally Posted by ggrayggray
Sorry RW, but Alana, who is about 11, asked for a simple explaination of how the rating system works. Providing a link to a professor's website to explain how the rating system works in intricate detail probably didnt help much at all.

I think Alana just wanted a simple explaination.
We all want a simple explanation...but you know the likelihood of that hapenning dont you?

8. Originally Posted by ggrayggray
Sorry RW, but Alana, who is about 11, asked for a simple explaination of how the rating system works. Providing a link to a professor's website to explain how the rating system works in intricate detail probably didnt help much at all.

I think Alana just wanted a simple explaination.
Sorry but I don't assume anything about a person's comprehension based purely on age. Some of the smartest people I know are 11.

BTW The links in my last post were to an article I wrote which was published in Australian Chess Forum a few years back and a spreadsheet that does glicko based calculations that is easy enough that even a Queenslander would be able to use it.

9. http://www.fide.com/official/handbook.asp?level=B0210

Despite being FIDE website, the explanation is quite good. I assume ACF system is simular. If not, perhaps ACF rating officer ought to publish an explanation of ACF rating system simewhere.

10. I would think Alana is probably around 14 rather than 11, but I'll let her deal with Garvin.

As suggested by Barry, the estimates are based on the "old" system which is similar to that described in the FIDE Handbook. It works reasonably well for people who have established ratings and mainly play others with established ratings, and play a typical number of games. I wouldn't rely on it to the decimal point if your qualification for the world championship depends on it but in terms of indicating whether you are likely to go up or down and by a big or small number it's not too bad.

Note that each tournament table shows the change due only to that tournament.

11. Originally Posted by Ian Rout
I would think Alana is probably around 14 rather than 11, but I'll let her deal with Garvin.
.
Alana is closer to 15 than 11. At her age she probably wants to be thought older than younger than she is. its only when you get over 35 that being thought 30% younger is a compliment...

12. Originally Posted by jenni
Alana is closer to 15 than 11. At her age she probably wants to be thought older than younger than she is. its only when you get over 35 that being thought 30% younger is a compliment...
Ahh good, at least SOMEONE knows my age around here... to be precise I am 5363 days, 16 hours, and 41 minutes old (14 years, 8 months, 31 days, 16 hours and 41 minutes old.

http://junior.ausnetchess.org/games/age.htm

And thanks to everyone who has tried to explain how the system works

13. and who is ggaryggray anyway??? who thinks i am 11 :@

14. The URL below didn't help very well, it is very confusing...

15. Originally Posted by Alana
and who is ggaryggray anyway??? who thinks i am 11 :@
ggrayggray is Garvin Gray from Queensland. Just an honest mistake about your age I guess.
Scott

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