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# Chess rating system

• #1061

To follow the basic idea of my system a positive score of 1.25 means the winner, takes 1.25 points per move on average from opponent.Remember that the mate

move "captures" all opponent pieces.

• #1062
tubebender wrote:

Don`t try to" reinvent the Wheel"; stay with either the Elo (for simplicity) or the Glickman modified Elo system used by the USCF.

more bending will spoil the tube.so appriciate ur understanding!

• #1063

Merry Christmas everyone!

• #1064

thanks, same to you and everyone

• #1065

Thnx ! same  to  everybody.

• #1066

anyone else get a little turned on by the bishop?

• #1067
chestonblumentahl wrote:

anyone else get a little turned on by the bishop?

...unpredictable !!

• #1068
andreic wrote:

I have an idea about how to rate players during a RR tournament., and a general extension in mind.

I believe a measure of the player strength relative to a certain game is given by the speed of the material gain. At the begining the material is even, and at the end  there are two posibilities:

1. The game is a draw(any chess rule leading to a draw) .

No one loses both sides keeps its armies for a feature battle. In this case the game score is given by

(material1 - material2)/(number_of_game_moves). One of the sides will have a positive score , while the other will have the same absolute score but with the sign changed.

2. The game ends in mate. The side which loses the game is considered to lose all  the material in the end, as the soldiers cannot fight without their king.

The score will be for the winner:

1.material_of_the_winner_at_last_move/number_of_game_moves

And for the loser will be

(- material_of_the_winner_at_last_move)/number_of_game_moves.

At a RR tournament is sufficient to add the score for every game for every player just like that.

If a player competes in different tournaments we must take into account the adversary strength, and the player ranking  is computed different.

The player strength is the average  of the cumulated game scores.

Suppose the players strengths are s1 and s2,number of games played so far are n1 and n2, and player 1 has a positive game result: r( a draw does not need to be a zero result).

Then compute

s1 =  (s1*n1+(s2/(s1+s2))*r)/(n1+1);

n1=n1+1;

s2=(s2*n2-(s2/(s1+s2))*r)/(n2+1);

n2=n2+1;

A simple numerical example s1=0.5 s2=0.26  n1=10 ; n2=25; r=1.25

New stregths:

s1= (0.5*10 + (0.26/0.76)*1.25)/11 = 0.49

s2= (0.26*25 - (0.26/0.76)*1.25)/26 =0.23

Also the probability the player 1 wins the player 2 is computed like (s1/s1+s2).

Before the game p=65%; after the game p=68%.

The interpretation of score 1.25:

If the number of moves in current game was 30 , it means the winner had 30*1.25 in material at the last move.

I will apreciate some feedback and how can we test this.

Andrei from Romania

appriciate ur Romanian formulae!! Wish u good luck % Happy New Year!

• #1069

Thanks.  A good year for every one.

• #1070
andreic wrote:

Thanks.  A good year for every one.

wish the same to u & all in Chess.com !!

• #1071
[COMMENT DELETED]
• #1072

"points" is an artificial concept - why not just throw in the towel and

have Houdini assign the ratings or play both sides for that matter?

• #1073
beardogjones wrote:

"points" is an artificial concept - why not just throw in the towel and

have Houdini assign the ratings or play both sides for that matter?

that could be an wonderful innovation to ur artificial concept!! of points.happy new year beardogjones.

• #1074
[COMMENT DELETED]
• #1075
Burginflickle wrote:
[COMMENT DELETED]

0+0=0.

• #1076

dare 2 challnge me!!!

• #1077
nitish63 wrote:

dare 2 challnge me!!!

hi nitish@63! U thrown ur gauntlet to everybody.Its heroic! appriciate!!!!!!

• #1078

My major issue with online ratings is there is no way to tell if the person who beat you used a chess engine. The minor ones are things like, why should a club player with an official rating from an offical sanctioning body of chess tournaments have to start at 1200 when he is a legit 1750? I am sure the argument will be that if he/she is truly that good, they will get there eventually. True, they will, but why take a student in 9th grade back in 4th? Just because 4th grade in the average grade of school students? That is plain ignorant. These few things really bother me. It makes it truly difficult to assess ones personal development. Chessmaster starts players at 1400. Maybe it is because of these complaints. I say start everyone high. If they aren't legit, they will fall fast.

• #1079

My major issue with online ratings is there is no way to tell if the person who beat you used a chess engine. The minor ones are things like, why should a club player with an official rating from an offical sanctioning body of chess tournaments have to start at 1200 when he is a legit 1750? I am sure the argument will be that if he/she is truly that good, they will get there eventually. True, they will, but why take a student in 9th grade back in 4th? Just because 4th grade in the average grade of school students? That is plain ignorant. These few things really bother me. It makes it truly difficult to assess ones personal development. Chessmaster starts players at 1400. Maybe it is because of these complaints. I say start everyone high. If they aren't legit, they will fall fast.

allgiance to certain desciline is a primary need for every player.So  a  norm which is equal to both the party seems to be a good practice.

• #1080

My major issue with online ratings is there is no way to tell if the person who beat you used a chess engine. The minor ones are things like, why should a club player with an official rating from an offical sanctioning body of chess tournaments have to start at 1200 when he is a legit 1750? I am sure the argument will be that if he/she is truly that good, they will get there eventually. True, they will, but why take a student in 9th grade back in 4th? Just because 4th grade in the average grade of school students? That is plain ignorant. These few things really bother me. It makes it truly difficult to assess ones personal development. Chessmaster starts players at 1400. Maybe it is because of these complaints. I say start everyone high. If they aren't legit, they will fall fast.

You can't just start people high... if everyone started 500 points higher, then eventually everyone's ratings would end up 500 points higher, because you'd pick up more rating points from the new people whose ratings haven't been lowered enough yet.  If you start people out at 1700, then the ratings system will adjust itself until the average new person IS a 1700.  And the people who used to be 1700 will now be 2200, etc.

Using official ratings from USCF or other bodies as a starting rating would probably be fine from a ratings standpoint, but how would you prove that you are who you say you are?  Premium membership using a credit card with your name on it?  Obviously they verify the titled players already, but it seems like it would be a pain for the staff to have to do it for everyone.

And as far as the chess engine goes, if someone's using an engine then they're going to be out of your ratings range pretty fast.  Assuming they don't just get caught and tossed from the site.

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