This page explains how Gary Gebert (USATT# 61113)'s rating went from 1858 to 1818 at the January 2015 NW LA Open held on - 18 Jan 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.