This page explains how Jacob Xiong (USATT# 266071)'s rating went from 530 to 448 at the MDTTC Tuesday/Friday League event from 19 Nov 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.