# Math behind these numbers, chess 'rating':

sonhouse
Posers and Puzzles 06 Mar '17 15:02
1. sonhouse
Fast and Curious
06 Mar '17 15:021 edit
So I have been playing chess on my smartphone, 'chess online' and they assign numbers when you play a certain number of games.

So I recorded the win/lose record before and after a number change,

Before the change, 840 wins, 141 losses. Number= 30
So I lost a game, 840 wins, 142 losses, new # = 31

I divided the totals and got nowhere. What is the math behind the change in my number? I had recorded earlier number changes but can't find it right now. Is there enough info in those two data points for an answer? For instance, 31 squared= 961, no help. 982-961=21 no help.
2. wolfgang59
Mr. Wolf
06 Mar '17 21:43
Originally posted by sonhouse
So I have been playing chess on my smartphone, 'chess online' and they assign numbers when you play a certain number of games.

So I recorded the win/lose record before and after a number change,

Before the change, 840 wins, 141 losses. Number= 30
So I lost a game, 840 wins, 142 losses, new # = 31

I divided the totals and got nowhere. What is ...[text shortened]... hose two data points for an answer? For instance, 31 squared= 961, no help. 982-961=21 no help.
Your rating on any site depends on your results and the rating of the opponent at the time.
The info is available here somewhere.
3. HandyAndy
Non sum qualis eram
06 Mar '17 22:49
Originally posted by sonhouse
So I have been playing chess on my smartphone, 'chess online' and they assign numbers when you play a certain number of games.

So I recorded the win/lose record before and after a number change,

Before the change, 840 wins, 141 losses. Number= 30
So I lost a game, 840 wins, 142 losses, new # = 31

I divided the totals and got nowhere. What is ...[text shortened]... hose two data points for an answer? For instance, 31 squared= 961, no help. 982-961=21 no help.
Perhaps the number is a handicap, similar to golf or bowling.
4. sonhouse
Fast and Curious
07 Mar '17 11:36
Originally posted by wolfgang59
Your rating on any site depends on your results and the rating of the opponent at the time.
The info is available here somewhere.
This is not a rating like we know it, it is just a number indicating how many games have been played. I also missed one number, the draws, so with the draws, 9 of them, the total is 990 which is the last 30 number I was assigned. With 991, it goes to 31. So it makes a bit more sense now, 990/30 = 33. So I will find out if the next end point of 31 is 1023, 31 X33.