This page explains how Sarah Shuangxia Zhu (USATT# 268233)'s rating went from 838 to 847 at the WCTTA Saturday League event from 28 Sep 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.