round_diff = round - parent_round if [0,3] ,diff =parent_diff + parent_diff/2048*2 if [4,7] ,diff =parent_diff + parent_diff/2048*1 if [8,11] ,diff =parent_diff all follow the formula below diff = (parent_diff + ((parent_diff / 2048) * max(2 - (round - parent_round) // 4, -99)) ).