This page explains how James Zhang (USATT# 98301)'s rating went from 1939 to 1917 at the MDTTC Tuesday/Friday League event from 11 Jan 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.