This page explains how Brian Tsang (USATT# 79859)'s rating went from 1741 to 1719 at the 2012 Junior Olympics/Nationals held on - 1 Aug 2012. 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.