This page explains how Gary D. Harbeck (USATT# 6425)'s rating went from 1958 to 1990 at the US Teams held on - 27 Nov 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.