This page explains how Kallista Liu (USATT# 94975)'s rating went from 2019 to 1991 at the MDTTC Tuesday/Friday League event from 29 May 2018. 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.