This page explains how Joon Chung (USATT# 91456)'s rating went from 1840 to 1830 at the 2015 HI October Open held on - 11 Oct 2015. 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.