This page explains how Cyndi (Xuxin) Zhang (USATT# 96337)'s rating went from 559 to 559 at the Swan Sunday League event from 13 Jan 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.