This page explains how Yichi Zhang (USATT# 89328)'s rating went from 2609 to 2597 at the 2017 Butterfly Southeastern Open held on 20 Oct 2017 - 22 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.