This page explains how Jonathan Gehrkin (USATT# 91627)'s rating went from 1223 to 1214 at the Westchester October 2022 Open held on 29 Oct 2022 - 30 Oct 2022. 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.