This page explains how Stephen Cheng (USATT# 221442)'s rating went from 615 to 621 at the MDTTC Tuesday/Friday League event from 12 Oct 2018. 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.