This page explains how Mark Johnson (USATT# 26863)'s rating went from 1613 to 1601 at the SVTTC Sunday U2000 event from 8 Apr 2012. 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.