20 May 15
in the FAQs the following is posted:
Players are rated using the following 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)
So win expectancy is >0 and <1 and k is >0 so together this implies that newscore>oldscore for a win.
I don't see therefore how score can decrease for a win...
Thanks
20 May 15
Originally posted by JeremyDRIt can decrease at the setup of the first rating, which is kind of calculated retrospectively...since there was no (real) win expectancy.
in the FAQs the following is posted:
Players are rated using the following 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 Expectanc ...[text shortened]... newscore>oldscore for a win.
I don't see therefore how score can decrease for a win...
Thanks