Why do regions get different allocations towards to Challenger Series The allocation is based on the size of membership per region in addition to the membership performance. Related articles What is the Challengers Series field size? How many surfers from each region will qualify for the Challenger Series? What are the regions? How do CS surfers qualify for the CT? How many 2020 results will count towards 2021 Regional QS Rankings? Comments 0 comments Article is closed for comments.