This page explains how Carmen Yu (USATT# 217532)'s rating went from 1255 to 1251 at the Westchester May 2019 Open held on 25 May 2019 - 26 May 2019. 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.