This page explains how Cheery Zhang (USATT# 218008)'s rating went from 1239 to 1221 at the Paddle Palace Club Fall Open held on 6 Oct 2018 - 7 Oct 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.