This page explains how Francis Litkee Kok (USATT# 280325)'s rating went from 689 to 660 at the HITTA Weekly League event from 29 Sep 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.