This page explains how Jinchang Chen (USATT# 96180)'s rating went from 1968 to 1959 at the 888 League event from 10 Oct 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.