This page explains how Sihyun Park (USATT# 1178382)'s rating went from 2163 to 2159 at the Westchester March 2023 Open held on 25 Mar 2023 - 26 Mar 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.