This page explains how Brian Walt (USATT# 84362)'s rating went from 1303 to 1300 at the Boston TTC Div.B event from 9 Apr 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.