#### Help Forum

1. 27 Jun '05 17:29
What happens if a provisionally ranked 1200 player draws with another provisionally ranked 1200 player in a rated game?

Will either rating change after the game?
2.  Wildfire
Force of Nature
27 Jun '05 19:56
Originally posted by skims
What happens if a provisionally ranked 1200 player draws with another provisionally ranked 1200 player in a rated game?

Will either rating change after the game?
I have no clue. Why don't you try it yourself.
3.  Bowmann
Non-Subscriber
03 Jul '05 16:17
4.  Wildfire
Force of Nature
03 Jul '05 20:26
Originally posted by Bowmann
Go play in someone else's sandbox.
5.  Bowmann
Non-Subscriber
03 Jul '05 22:37
Originally posted by Wildfire
Go play in someone else's sandbox.
That reminds me, when's Katty due back?
6. 04 Jul '05 08:42
meeuw!
7.  Daemon Sin
I'm A Mighty Pirateā¢
04 Jul '05 15:34
Originally posted by Bowmann
That reminds me, when's Katty due back?
Why, you fed up chasing cars and p*ss*ng on trees already so you need your favourite leg to hump?
8. 06 Jul '05 02:39
If you have less than 5 games, no. Otherwise I have attepted the math:

K=32

Old Rating=1200

Score = .5

Win Expectancy = 1 / (10^((OpponentRating-YourRating)/200)+1)
= 1 / (10^((1200-1200/200)+1)
= 1 / (10^1)
= 1 / 10
= .1

New Rating = Old Rating + K * (Score - Win Expectancy)
= 1200 + 32 * (.5 - .1)
= 1200 + 32 * .4
= 1200 + 12.8
= 1213

9.  XanthosNZ
Cancerous Bus Crash
06 Jul '05 10:36
If you have less than 5 games, no. Otherwise I have attepted the math:

K=32

Old Rating=1200

Score = .5

Win Expectancy = 1 / (10^((OpponentRating-YourRating)/200)+1)
= 1 / (10^((1200-1200/200)+1)
= 1 / (10^1)
= 1 / 10
= .1

New Rating = Old Rating + K * (Score - Win Expectancy)
...[text shortened]... 0 + 32 * (.5 - .1)
= 1200 + 32 * .4
= 1200 + 12.8
= 1213

The win expectancy formula is used when you have played more than 20 games (your rating isn't provisional anymore).

Until you complete 20 games (and you've completed more than 5) your rating is the average of all your game values.
The game value is your opponent's rating + 400 if you win , -400 if you lose. It's equal to your opponent's rating if you draw.
If your opponent is provisional the 400s are 200s.

Therefore if two p1200's play each other and draw no change is made to their ratings.
10. 06 Jul '05 11:29
If you have less than 5 games, no. Otherwise I have attepted the math:

K=32

Old Rating=1200

Score = .5

Win Expectancy = 1 / (10^((OpponentRating-YourRating)/200)+1)
= 1 / (10^((1200-1200/200)+1)
= 1 / (10^1)
= 1 / 10
= .1

New Rating = Old Rating + K * (Score - Win Expectancy)
...[text shortened]... 0 + 32 * (.5 - .1)
= 1200 + 32 * .4
= 1200 + 12.8
= 1213

what's 'K'?
is it always 32?
11.  XanthosNZ
Cancerous Bus Crash
06 Jul '05 11:52
Originally posted by Florrat
what's 'K'?
is it always 32?
Read the FAQ, it has a detailed breakdown for the rating calculation:

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