This page explains how Dongyong Zhou (USATT# 87743)'s rating went from 1938 to 1922 at the OC Magic Spin TTC Open held on - 24 May 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.