This page explains how Eugene Zhang (USATT# 215719)'s rating went from 1421 to 1413 at the Westchester 2024 January Open held on 27 Jan 2024 - 28 Jan 2024. 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.