This page explains how Keenan Southall (USATT# 94314)'s rating went from 1870 to 1973 at the Boston TTC event from 27 Jun 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.