This page explains how Anyang Chen (USATT# 277521)'s rating went from 80 to 66 at the ICC - Sunday Beginners League event from 24 Sep 2023. 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.