This page explains how Chuanying Du (USATT# 265099)'s rating went from 83 to 66 at the ICC - Sunday Beginners League event from 26 Nov 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.