This page explains how Peter Lawless (USATT# 218487)'s rating went from 1217 to 1226 at the Boston TTC Div.B event from 17 Jul 2017. 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.