This page explains how David Roberts (USATT# 55604)'s rating went from 2229 to 2228 at the 1999 4th Annual US Nationals W held on - 11 Dec 1999. 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.