This page explains how Judy Hoarfrost (USATT# 6692)'s rating went from 1970 to 1964 at the Rose City Open held on - 29 Jun 1997. 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.