This page explains how Chettra Ly (USATT# 1688)'s rating went from 1694 to 1691 at the 2021 SPTTC JULY OPEN held on 24 Jul 2021 - 25 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.