This page explains how Kevin Zhou (USATT# 82151)'s rating went from 1781 to 1767 at the HCTT Circuit 2015 September held on - 5 Sep 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.