This page explains how Albert Lan (USATT# 203136)'s rating went from 1768 to 1752 at the LATTA Butterfly Open February 2023 held on 25 Feb 2023 - 25 Feb 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.