This page explains how Brian Chia (USATT# 30737)'s rating went from 2139 to 2130 at the Spttc Saturday Night League event from 15 May 2021. 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.