This page explains how Andrew J. Lewis (USATT# 85501)'s rating went from 1023 to 1073 at the Trolley Car TT Club Philly Ope held on - 11 Dec 2011. 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.