Player rating for tournaments across all installments of Heroes.

A purely gameplay-based rating includes an element of aging. But how do you account for aging if not everyone will play all versions? That's why it's necessary to somehow combine such a rating with Grails.

I would like to hear your opinion on my idea with different "currencies" to make it easier to convert everything into Grails later?

Some changes suggested by Alan have been made to the first post.