This page explains how Mark Johnson (USATT# 26863)'s rating went from 1850 to 1869 at the 2006 Western Open held on - 19 Feb 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.