This page explains how Songling Ngo (USATT# 219645)'s rating went from 1211 to 1154 at the Spttc Saturday Night League event from 24 Mar 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.