This page explains how Zack Guido (USATT# 214914)'s rating went from 1147 to 1294 at the Westchester 2017 May Open held on 27 May 2017 - 28 May 2017. 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.