This page explains how Aron Zhang (USATT# 97413)'s rating went from 1970 to 1989 at the MDTTC Butterfly October Open held on 14 Oct 2017 - 15 Oct 2017. 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.