This page explains how Blake Cottrell (USATT# 87424)'s rating went from 1803 to 1788 at the 2015 South Shore Butterfly Open held on - 25 Oct 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.