This page explains how Rachel Ou (USATT# 96726)'s rating went from 1980 to 1964 at the Topspin Advanced League event from 2 Feb 2019. 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.