This page explains how David Sakai (USATT# 9668)'s rating went from 2059 to 2058 at the Butterfly Cary Cup held on 30 Mar 2017 - 2 Apr 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.