FAQ

ChessCube Ratings

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gm_sulav

Pawn

Posts: 6

Joined: Fri Apr 15, 2011 6:20 pm

Post Thu Oct 13, 2011 4:14 am

Re: ChessCube Ratings

i don't , agree with this kind of system ..
it's great, having ur RATIIN stable .. but, this is an international chess site.. so it should have, the international chess rulez
it's only fair in my opinion..

Besides, it can only harm , players, psychic than do good, as they will have, mis conception .

But. i suppose, chesscube admin know what they are doin.. :)
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j00j4nt200

Pawn

Posts: 10

Joined: Sun Feb 27, 2011 1:17 am

Post Sun Oct 16, 2011 11:28 pm

Re: ChessCube Ratings

Hello,

1.
I tried to simulate formula for curiosity purpose.
Let say I have 2172ratio, and my opponent have 2013 - I win and should have 2179, but in excel i can't get it right:
=2172+24*(1-(1/(1+(10*((2013-2172)/400)))))
Can you help me find where is my mistake? :)

2.
Can you tell me (for curiosity purpose again) what is average user ratio last year, and this year?
And what is average user ratio (for user that played more than 1k games) last year and this year?

3.
About Rating floor - i Don't understand it :)
- Let say again that my ratio is 2172 -if I understand correctly my floor is 1972/2372 ?
I played game and win my ratio is 2179 - did my floor automatically changed to 1979/2379 - what's the point in floor then? Or there is some other condition that i don't understand?
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xabichess

User avatar

Rook

Posts: 322

Joined: Fri Feb 04, 2011 1:50 am

Post Tue Oct 18, 2011 8:34 am

Re: ChessCube Ratings

Good day,

j00j4nt200 wrote:3.
About Rating floor - i Don't understand it :)
- Let say again that my ratio is 2172 -if I understand correctly my floor is 1972/2372 ?
I played game and win my ratio is 2179 - did my floor automatically changed to 1979/2379 - what's the point in floor then? Or there is some other condition that i don't understand?


Your floor rating as it has been said would be your max rating -200 if your max rating is 2179 your floor rating is 1900. Once you reach 2200 your floor rating will change to 2000 and it goes like that until 2400 where the minimun floor rating is 2200, this means that if you get to 2800 your floor rating is still 2200.

Regards Xabier,

PS: I iwll answer other questions later whne I have time.
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j00j4nt200

Pawn

Posts: 10

Joined: Sun Feb 27, 2011 1:17 am

Post Tue Oct 18, 2011 9:44 pm

Re: ChessCube Ratings

@xabi
Thank you, now is crystal clear :)

I not sure is it good feature, or ratio inflation risk?
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minichess

User avatar

Bishop

Posts: 111

Joined: Wed Oct 19, 2011 10:51 am

Post Wed Oct 19, 2011 11:01 am

Re: ChessCube Ratings

without rating no fun (h)
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xabichess

User avatar

Rook

Posts: 322

Joined: Fri Feb 04, 2011 1:50 am

Post Wed Oct 19, 2011 11:22 pm

Re: ChessCube Ratings

Good evening,

j00j4nt200 wrote:1.
I tried to simulate formula for curiosity purpose.
Let say I have 2172ratio, and my opponent have 2013 - I win and should have 2179, but in excel i can't get it right:
=2172+24*(1-(1/(1+(10*((2013-2172)/400)))))
Can you help me find where is my mistake? :)


First it is not like that, let's do this, with your rating, New rating as X ->

X = old rating (2172) + Kfactor(24)*(result(1) - [1/{ 1+10^((2013-2172)/400)}]) --> let's put this easier. First we will start from the right. 2013-2172 = -159 -> -159/400 = -0,3975 --> 10^(-0,3975) = 0,4004054683305463421664975725889 -> 1+0,4004054683305463421664975725889 = 1,4004054683305463421664975725889. Now we divide 1 with 1,4004054683305463421664975725889. -> 0,71407890258535025281131344970418,

next step: x = 2172 + 24 * ( 1-0,71407890258535025281131344970418) -> 1 - 0,71407890258535025281131344970418 = 0,28592109741464974718868655029582 - > next step is multipliying with the k factor.
24 * 0,28592109741464974718868655029582 = 6,8621063379515939325284772070996 ~ nearly 7,

now we solve the new rating.

New rating (x) = 2172 + 6,8621063379515939325284772070996 = 2178,8621063379515939325284772071 since there is no coma, your new rating is 2178+1 = 2179. This means:

New rating (X) = 2179 !!

I hope that helps a bit.

j00j4nt200 wrote:2.
Can you tell me (for curiosity purpose again) what is average user ratio last year, and this year?
And what is average user ratio (for user that played more than 1k games) last year and this year?


I have no idea what the average rating is, but it used to be around 1635 or so when I joined chesscube some 1 year and a half ago. I suppose it is much alike now. maybe a bit higher up to 1800 although I am not too sure.

Regards Xabier.
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j00j4nt200

Pawn

Posts: 10

Joined: Sun Feb 27, 2011 1:17 am

Post Thu Oct 20, 2011 1:11 am

Re: ChessCube Ratings

Here is simulation in excel tnx to xabichess.

If you win opponent with exact same ratio you will get +12 and for loosing -12
Maximum win or lose ratio per game is 24.

If you play with someone who have much stronger ratio than you, for example for you are 2000 and opponent is 2600, for winning you will get +24, and for loosing you will lose 0.
Average player only need to keep winning over 2600 ratio players to gain ratio ;)
Attachments
chesscuberatio.zip
(6.64 KiB) Downloaded 455 times
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buki82

User avatar

Bishop

Posts: 249

Joined: Mon Sep 19, 2011 10:42 am

Location: Europe-Republic of Kosovo

Post Thu Oct 20, 2011 1:38 pm

Re: ChessCube Ratings

Does a time affect,to divide when the opponent loses, example: If I play with 2 opponents , with same points player 1 (1940 rate ) player 2 (1940 rate too ), not at the same time, but with the same points,one of them lost in time during playing the game, while the other has check mat, very quickly not to much then to 6 or 8 moves. or it depends also different way of playing.

Thank's
- buki82
I can write, only when I'm online in chesscube forum...!
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therunaway

Pawn

Posts: 1

Joined: Fri Jun 24, 2011 6:37 am

Post Mon Oct 24, 2011 12:17 pm

Re: ChessCube Ratings

Couple of hours ago I had a game in which my opponent won 32 points and I lose 16. And the opposite too, while I was winning xpoints my opponent was losing 2xpoints. Where is the logic? I can't figure this out.
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Sansen

Site Admin

Posts: 1473

Joined: Mon Jan 24, 2011 12:56 am

Post Mon Oct 24, 2011 3:12 pm

Re: ChessCube Ratings

therunaway wrote:Couple of hours ago I had a game in which my opponent won 32 points and I lose 16. And the opposite too, while I was winning xpoints my opponent was losing 2xpoints. Where is the logic? I can't figure this out.


Hi,

Could you tell us who your opponent was? Most likely your opponent was provisionally rated.
I sometimes drift over this way,, but not very often
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