This page explains how Marilyn Arvidson (USATT# 23410)'s rating went from 584 to 584 at the St Louis Gateway Open held on - 21 Jul 2002. 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.