This page explains how Ewan Zhang (USATT# 264897)'s rating went from 1814 to 1801 at the Bay Area Butterfly Championships held on 11 Nov 2023 - 11 Nov 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.