This page explains how Hao An Do Ngoc (USATT# 275709)'s rating went from 1371 to 1366 at the HITTA Weekly League event from 4 Feb 2023. 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.