This page explains how Pyounguk Cho (USATT# 273651)'s rating went from 431 to 419 at the 888 League event from 8 May 2022. 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.