This page explains how Joon Chung (USATT# 91456)'s rating went from 1665 to 1643 at the HI Friday event from 13 Sep 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.