This page explains how Johan Athial (USATT# 269864)'s rating went from 1227 to 1221 at the Central Carolinas Super League event from 19 Aug 2021. 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.