This page explains how Yieng Lou (USATT# 87617)'s rating went from 2108 to 1993 at the LATTA Butterfly Open August 2023 held on 26 Aug 2023 - 26 Aug 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.