Player rating for tournaments across all installments of Heroes.

...to change (increase or decrease) ratings, you need to take the average between the current rating and the rating for the current tournament...

I would like to point out that in this case, a successful performance in the previous tournament will reduce the result of the current tournament for that player. Which, from a common-sense perspective, is questionable - this mechanism contradicts itself - the worse I perform, the more I gain, and vice versa...

Just for information.