This page explains how Ta Ching (Tommy) Chang (USATT# 34131)'s rating went from 1754 to 1749 at the Scenic City Open held on - 6 Jun 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.