This page explains how Fred L. Grimsrud (USATT# 37476)'s rating went from 1670 to 1687 at the Arizona Open held on - 20 Feb 1994. 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.