This page explains how Joon Chung (USATT# 91456)'s rating went from 1820 to 1815 at the Westchester November 2018 Open held on 17 Nov 2018 - 18 Nov 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.