This page explains how Xiaoping Zhu (USATT# 215951)'s rating went from 1971 to 1969 at the Topspin Advanced League event from 6 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.