This page explains how Mark Johnson (USATT# 26863)'s rating went from 1886 to 1799 at the 2006 Berkeley Open held on - 3 Sep 2006. 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.