This page explains how Calvin Tinhang Chan (USATT# 73906)'s rating went from 1649 to 1549 at the New Jersey TTC Youth League event from 31 Jan 2009. 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.