This page explains how Danny Qun Zhang (USATT# 220501)'s rating went from 1550 to 1550 at the NJTTC Thursday Adv League event from 6 Feb 2020. 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.