This page explains how Lois M. Copley (USATT# 51996)'s rating went from 640 to 590 at the OCTTC Spring Open held on - 18 Mar 1995. 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.