This page explains how Hongyan Lu (USATT# 95883)'s rating went from 1809 to 1819 at the Butterfly Spin &Smash October Open held on 1 Oct 2021 - 3 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.