This page explains how Michael W. Branch (USATT# 60457)'s rating went from 630 to 643 at the Maryland Aug. Circuit - Giant held on - 25 Aug 2001. 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.