This page explains how David Roberts (USATT# 55604)'s rating went from 2217 to 2219 at the 2017 SPITTC WA State Championship & September Open held on 16 Sep 2017 - 17 Sep 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.