This page explains how Natalie Chan (USATT# 198840)'s rating went from 1901 to 1898 at the WCTTA Saturday League event from 14 Dec 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.