How to calculate my rating

I am 1586 and I am about to beat a 1820 opponent (OK, sorry about that 😀) How do I calculate my rating change?

Originally posted by Alopinto
I am 1586 and I am about to beat a 1820 opponent (OK, sorry about that 😀) 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

There are quite a few free rating calculators available on the web. You can google "chess rating calculator" and pull on up.

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.

Add to favorites!

P-

yep! do that! 🙂
th

Did Plab get modded here???

Don't think I've seen that before...🙄

Originally posted by Saint Nick
Did Plab get modded here???

Don't think I've seen that before...🙄

No, I copied it from another thread! 🙂
Well spotted! 😀
th