This page explains how Pyounguk Cho (USATT# 273651)'s rating went from 662 to 630 at the 888 League event from 22 Jan 2023. 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.