This page explains how Hongyan Lu (USATT# 95883)'s rating went from 1822 to 1809 at the 56th RoboPong St. Joseph Valley Open held on 28 May 2021 - 30 May 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.