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Or maybe just do it as VBN suggested. Don't change anything in the formula, but after calculating all the ratings for the tournament, just divide each rating by the corresponding number, like by 10 or 100?
But since this is an online Heroes tournament, we also need to include Gw and Gl. That's the question here.
And if we don't include them, then we can consider the formula ready. :)
P.S. The old rating there is not 1/3, but 2/3;). This is significant.
:D