This page explains how Tsz kee Siu (USATT# 281184)'s rating went from 1830 to 1827 at the PTTC Saturday League event from 22 Jun 2024. 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.