This page explains how Robert Roberts (USATT# 57410)'s rating went from 2384 to 2421 at the 1998 North American Teams Cham held on - 29 Nov 1998. 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.