This page explains how Sophia Zhuo-yao Chen (USATT# 221729)'s rating went from 898 to 890 at the ICC - Sunday Beginners League event from 20 Jun 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.