This page explains how Jiufeng Zhao (USATT# 223669)'s rating went from 1880 to 1868 at the PTTC Saturday League event from 30 Sep 2022. 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.