This page explains how Alvin Chen (USATT# 89725)'s rating went from 1570 to 1563 at the Westchester 2014 September Open held on - 28 Sep 2014. 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.