This page explains how Natalie Chan (USATT# 198840)'s rating went from 1995 to 1977 at the WCTTA Saturday League event from 15 Feb 2020. 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.