This page explains how Ziqi Calista Zhang (USATT# 271326)'s rating went from 383 to 421 at the 888 League event from 20 Feb 2022. 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.