27 Sep '06 18:40>
Correct me if I'm wrong but did I just get 2 points for beating my friend who is more then 400 points lower then me?
1816 to 1818 I believe.
1816 to 1818 I believe.
Originally posted by wormwoodI looked at those formula's and I ain't getting exactly the right answers.
Thread 50455
Originally posted by wormwood
Win Expectancy = 1 / (10^((OpponentRating-YourRating)/400)+1).
the 32 is the amount you win if you're exactly 400 pts lower, or lose to someone 400 pts lower. if you win a 600pts higher opponent, you'll get more than 32.
but if you win a 400 pts lower rated player, it's only ...[text shortened]... (d/400) = -1/(1.5/32 - 1) - 1
d = [b]-523,28 if it's floored from 1.5 to 1 point.[/b]
Originally posted by RahimKoh, you're right. winexp against 400 pts higher is 9.09%
I looked at those formula's and I ain't getting exactly the right answers.
You are 1400 you play against a 1800 and win.
1800-1400 = 400/ 400 = 1
10 ^1 = 10
10+1 = 11 1/11 = 0.0909 repeating
1-0.0909...= 0.9090....
0.9090*32 = 29.0909
Not 32 points.
600 points higher and you win = 31 points.
Formula wrong, Calculator wrong or is it me?
Originally posted by wormwoodPerformance can't be measured absolutely; it can only be inferred from wins and losses. Ratings therefore have meaning only relative to other ratings. Therefore, both the average and the spread of ratings can be arbitrarily chosen. Élő suggested scaling ratings so that a difference of 200 rating points in chess would mean that the stronger player has an expected score of approximately 0.75....
oh, you're right. winexp against 400 pts higher is 9.09%
gain = 32*(1-0.0909...) = 29.09 just like you said. you also see here that you'd need an infinite rating difference to gain exactly 32 points.
so now I'm wondering where does the 400 in the original formula actually come from? is it an arbitrary statement that says "you will win 1 game and los ...[text shortened]... onvergence factor which determines the step size (ie. speed) this convergence happens with.
Originally posted by wormwoodIt was all a lie they told me when I joined the chess club. 32 points for a win over a 400 player. What a lie! you get 29.44 points for that .
oh, you're right. winexp against 400 pts higher is 9.09%
gain = 32*(1-0.0909...) = 29.09 just like you said. you also see here that you'd need an infinite rating difference to gain exactly 32 points.
so now I'm wondering where does the 400 in the original formula actually come from? is it an arbitrary statement that says "you will win 1 game and los ...[text shortened]... onvergence factor which determines the step size (ie. speed) this convergence happens with.
Originally posted by z00tAren't you allowed to play friends :'(
RahimK, I thought you were more sensible than that! Shame on you. Are you among the players who target 1200-1600 players for easy pickings?