This page explains how Mark Johnson (USATT# 26863)'s rating went from 1858 to 1815 at the 2010 Spin Magicians Fremont Fa held on - 7 Nov 2010. 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.