This page explains how Jiufeng Zhao (USATT# 223669)'s rating went from 1811 to 1880 at the PTTC Saturday League event from 30 Jun 2018. 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.