This page explains how Mark Johnson (USATT# 26863)'s rating went from 1921 to 1879 at the 2008 Life West Open held on - 31 Aug 2008. 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.