This page explains how Harold E. Fredrickson (USATT# 5900)'s rating went from 1466 to 1407 at the Portland Open held on - 20 Aug 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.