This page explains how Roscoe Lock (USATT# 21921)'s rating went from 1961 to 1965 at the Paddle Palace 2007 Seattle Ope held on - 10 Jun 2007. 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.