#### Help Forum

1. 21 Dec '04 23:29
I am 1586 and I am about to beat a 1820 opponent (OK, sorry about that ðŸ˜€) How do I calculate my rating change?
2.  Ragnorak
21 Dec '04 23:38
Originally posted by Alopinto
I am 1586 and I am about to beat a 1820 opponent (OK, sorry about that ðŸ˜€) How do I calculate my rating change?
You apply the values to this formula...

New Rating = Old Rating + K * (Score - Win Expectancy)

K is a constant (32 for 0-2099, 24 for 2100-2399, 16 for 2400 and above)

Score is 1 for a win, 0.5 for a draw and 0 for a loss.

The Win Expectancy is calculated using the following formula :

Win Expectancy = 1 / (10^((OpponentRating-YourRating)/400)+1)

Or you just read the next line...

1611. I have an excel spreadsheet to do it, but I know somebody wrote an online tool to work it out.

D
3.  Saint Nick
Pimp of the elves
22 Dec '04 00:17
There are quite a few free rating calculators available on the web. You can google &quot;chess rating calculator&quot; and pull on up.
4.  thire
Xebite
22 Dec '04 07:33
Originally posted by Phlabibit
Gregoftheweb made this nifty rating calculator:

http://www7.brinkster.com/obyrne/rhp_rc.htm

It will even tell you your percentage chance to win a game, based on ratings.

P-
yep! do that! ðŸ™‚
th
5.  Saint Nick
Pimp of the elves
22 Dec '04 15:47
Did Plab get modded here???

Don't think I've seen that before...ðŸ™„
6.  thire
Xebite
22 Dec '04 22:15
Originally posted by Saint Nick
Did Plab get modded here???

Don't think I've seen that before...ðŸ™„
No, I copied it from another thread! ðŸ™‚
Well spotted! ðŸ˜€
th