This page explains how Natalie Chan (USATT# 198840)'s rating went from 1879 to 1866 at the WCTTA Saturday League event from 9 Nov 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.