This page explains how Sophia Zhuo-yao Chen (USATT# 221729)'s rating went from 647 to 831 at the WCTTA Saturday League event from 7 Dec 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.