This page explains how Aidan Chen (USATT# 220790)'s rating went from 831 to 828 at the 2018 Capital Plastics Butterfly Youth held on 17 Mar 2018 - 18 Mar 2018. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.