This page explains how Andrew J. Lewis (USATT# 85501)'s rating went from 1138 to 1273 at the Trolley Car Giant Round Robin held on - 22 Aug 2015. 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.