This page explains how Dave Peradotto (USATT# 42747)'s rating went from 1969 to 1954 at the Davison Athletic Club June Ope held on - 27 Jun 2009. 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.