This page explains how Zhiyong Zhang (USATT# 271228)'s rating went from 1505 to 1500 at the HITTA Weekly 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.