This page explains how Triet Kha (USATT# 212847)'s rating went from 1628 to 1621 at the 888 League event from 21 Nov 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.