This page explains how Katherine Dong (USATT# 214719)'s rating went from 1409 to 1397 at the LYTTC Friday Pro League event from 19 Jul 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.