This page explains how James R. Hill (USATT# 70650)'s rating went from 1511 to 1505 at the Boston TTC Div.B event from 22 May 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.