This page explains how Mark Johnson (USATT# 26863)'s rating went from 1427 to 1426 at the SVTTC Sunday U2000 event from 1 Feb 2015. 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.