Re: How is the club war ranking calculated?

There is no strong win or wek win. Just win, lose and tie.

The first step is to compute the transformed rating for each player or team:

R1 = 10 ^ r1/L

R2 = 10 ^ r2/L

This is just to simplify the further computations. In the second step we calculate the expected score for each player:

E1 = R1 / (R1 + R2)

E2 = R2 / (R1 + R2)

Now we wait for the match to finish and set the actual score in the third step:

S1 = 1 if player 1 wins / 0.5 if draw / 0 if player 2 wins

S2 = 0 if player 1 wins / 0.5 if draw / 1 if player 2 wins

Now we can put it all together and in a fourth step find out the updated Elo-rating for each player:

r'1 = r1 + K * (S1 – E1)

r'2 = r2 + K * (S2 – E2)

(E.g. K=32, L=400)

Note, that r'1 + r'2 = r1 + r2

We could calculate L and K by examples if EA would use Elo's score. But they are not:

r1=1528 r2=1582

S1=0 S2=1

r'1=1498 r'2=1612

r1=1528 r2=1582

S1=1 S2=0

r'1=1554 r'2=1556

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