Rating Calculation

My maths knowledge is a little short of being able to comprehend the explanation in the FAQ of how the ratings are calculated - could anyone offer a more detailed explanation?

If you play equally ranked players and win mostly, it goes up, if you lose mostly it goes down, and if you draw (or break even) it stays the same.

Not sure why anyone wants more detail than this, it's just a number in a database that a few people get too precious about.

Originally posted by Mahout
My maths knowledge is a little short of being able to comprehend the explanation in the FAQ of how the ratings are calculated - could anyone offer a more detailed explanation?

Roughly speaking, if you beat someone of the same rating as you, you gain 16 pts. For every 100 pts higher/lower their rating is to yours, you gain 4pts more/less for each victory up to a maximum of 32pts. The opposite is true for defeats.

Its not exact but close enough.

Originally posted by Snowman606
Roughly speaking, if you beat someone of the same rating as you, you gain 16 pts. For every 100 pts higher/lower their rating is to yours, you gain 4pts more/less for each victory up to a maximum of 32pts. The opposite is true for defeats.

Its not exact but close enough.

Originally posted by blade68
If only football matches afforded similar points values eh?

Originally posted by Snowman606
We'd definitely be in minus figures by now

Originally posted by rhb
If you play equally ranked players and win mostly, it goes up, if you lose mostly it goes down, and if you draw (or break even) it stays the same.

Not sure why anyone wants more detail than this, it's just a number in a database that a few people get too precious about.

Originally posted by invigorate
Beat a much higher player and it your rating will go up a lot (to a maximum of 32 points)

Draw and there will be minimal impact.

Lose to a bad player and you ranking will fall dramatically to a maximum of 32 points.

Therefore you have very little to lose by playing very good players.

Edit: Congrats on acheving your ambition

Any mathamaticians able to satiate my desire to comprehend the maths as presented in the FAQ pages? I'm now across the general principle and a have with a method for making rough calculations.

Originally posted by Mahout
Any mathamaticians able to satiate my desire to comprehend the maths as presented in the FAQ pages?

OK the bit I don't understand is in the following line:

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

Is it: Old rating + 32 to the power of the score minus the win expectancy?

Score being 1, 0.5 or 0 depending and win expectancy derived from the calculation shown further down the explanation.

Unfamilar with these things I'm not sure how to interperet the star or if the - is a hyphon or a minus symbol.

Originally posted by Mahout
OK the bit I don't understand is in the following line:

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

Is it: Old rating + 32 to the power of score minus win expectancy?

Score being 1, 0.5 or 0 depending and win expectancy derived from the calculation shown further down the explanation.

Unfamilar with these things I'm not sure how to interperet the star and or if the - is a hyphon or a minus symbol.

Originally posted by Snowman606
Its 32 multiplied by (score - win expectancy).

So if you are equal rating, win expectancy is 0.5 so New Rating = Old Rating + (32 x (1-0.5)) = Old Rating + 16

Generally in evaluating mathematical expressions, apply this:

http://en.wikipedia.org/wiki/BODMAS