This page explains how Douglas Hill (USATT# 27989)'s rating went from 1189 to 1138 at the Westchester 2015 August Open held on - 29 Aug 2015. 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.