Another Q about ratings

Can the players' ratings be used to caculate the probability of winning? For example, if a player of rating 1300 plays against a player of 1800, can the probability of winning be calculated? If so, what's the formula?

Originally posted by znsho
Can the players' ratings be used to caculate the probability of winning? For example, if a player of rating 1300 plays against a player of 1800, can the probability of winning be calculated? If so, what's the formula?

Arg! Where did the ratings calculator go@!?!???!

Gah!!!!!

P-

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

(It's gone... gone!!!)

Originally posted by znsho
Can the players' ratings be used to caculate the probability of winning? For example, if a player of rating 1300 plays against a player of 1800, can the probability of winning be calculated? If so, what's the formula?

Yes.
Yes ( 5,3% ).
See the section "How is my rating calculated?" in the FAQ.

OK, I've sussed it - it's the winning expectancy:

1 divided by 1 over ten to the power of .............

http://www7.brinkster.com/obyrne/rhp_rc.htm
(It's gone... gone!!!)[/b]

here's one : http://chess.cern.ch/ratings/elocalc.en.shtml

Ok I have got another question regarding ratings.

Say I am playing against a 1300 opponent. By the time I defeat him, his rating had shot-up to 1600. Which of the opponents rating will be taken into account, 1300 or 1600?

Originally posted by yashsr
Ok I have got another question regarding ratings.

Say I am playing against a 1300 opponent. By the time I defeat him, his rating had shot-up to 1600. Which of the opponents rating will be taken into account, 1300 or 1600?

It's always calculated from the current ratings of the two players. So in this example it would be worked out on the basis of your expected performance against someone rated 1600.

Thanks David