This page explains how Thuan Dao (USATT# 88259)'s rating went from 1899 to 1887 at the HITTA Weekly League event from 12 Dec 2021. 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.