This page explains how Kevin Tran (USATT# 34645)'s rating went from 657 to 639 at the ICC Juniors and Adults League event from 27 Sep 2006. 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.