This page explains how Sophia Zong (USATT# 280254)'s rating went from 21 to 7 at the PTTC Saturday League event from 4 Nov 2023. 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.