This page explains how Kit Poon (USATT# 85753)'s rating went from 1498 to 1490 at the Westchester March 2019 Open held on 30 Mar 2019 - 31 Mar 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.