This page explains how Tong Liu (USATT# 132211)'s rating went from 1894 to 1893 at the Swan Friday O2000 Team League event from 15 Feb 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.