This page explains how Brian Walt (USATT# 84362)'s rating went from 1309 to 1309 at the Boston TTC Div.B event from 22 Jan 2018. 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.