This page explains how Joon Chung (USATT# 91456)'s rating went from 1688 to 1687 at the HI Friday event from 17 Nov 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.