This page explains how George Yang (USATT# 74240)'s rating went from 1907 to 1855 at the Spttc Saturday Night League event from 12 May 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.