This page explains how Mingyan Zhang (USATT# 219649)'s rating went from 438 to 438 at the Spttc Saturday Night League event from 22 Sep 2018. 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.