This page explains how Matt Mathews (USATT# 18730)'s rating went from 1583 to 1578 at the RITTA 2015 Fall Open held on - 18 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.