This page explains how Songling Ngo (USATT# 219645)'s rating went from 999 to 981 at the Spttc Saturday Night League event from 3 Nov 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.