This page explains how Daming Li (USATT# 218517)'s rating went from 1307 to 1258 at the Westchester 2017 July Open held on 29 Jul 2017 - 30 Jul 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.