This page explains how Brandon Koh (USATT# 85572)'s rating went from 1800 to 1799 at the 2013 Junior Olympics/Junior Nationals held on - 31 Jul 2013. 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.