This page explains how Jonathan Chan (USATT# 1172196)'s rating went from 614 to 620 at the 2021 MDTTC October Open held on 9 Oct 2021 - 10 Oct 2021. 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.