This page explains how Ihyun Jeon (USATT# 268649)'s rating went from 1493 to 1480 at the ICC - Advanced League event from 17 Jul 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.