This page explains how Songling Ngo (USATT# 219645)'s rating went from 1171 to 1160 at the Spttc Saturday Night League event from 27 Apr 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.