This page explains how Vivian Cai (USATT# 1164293)'s rating went from 816 to 823 at the HCTT Players Development League event from 29 Jun 2019. 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.