This page explains how Daniel Dotson (USATT# 219388)'s rating went from 623 to 613 at the 2019 SPTTC WA State Championships & October Open held on 26 Oct 2019 - 27 Oct 2019. 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.