This page explains how John R. Houser (USATT# 14686)'s rating went from 870 to 850 at the 2015 Austin Fall Classic Round Robin Tournament held on - 17 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.