This page explains how Benjamin Zhang (USATT# 82612)'s rating went from 1861 to 1860 at the Westchester 2013 December Open held on - 15 Dec 2013. 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.