Player rating for tournaments across all installments of Heroes.

I don't understand which randomizer was used to obtain these numbers. In your example: Rb(winner) = 100 (it's always 100) Rb(last place for b=3) = 8.64 For the second case: Rb(winner) = 100 Rb(last place) = 1.44. Everything is normal. And the final rating cannot be determined based on your data, because the average ratings of all participants before the tournament are unknown. But Rb of each participant is multiplied by the same number, ranging from zero to infinity (although in practice, it's somewhere up to 3).