This page explains how Hyun Ook Ryu (USATT# 88326)'s rating went from 1627 to 1563 at the Spttc Saturday Night League event from 13 Jan 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.