This page explains how Eric J. Ziegler (USATT# 88227)'s rating went from 1430 to 1405 at the Tucson Open & Giant Round Robin Tournament held on 31 Oct 2015 - 1 Nov 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.