This page explains how Mark Johnson (USATT# 26863)'s rating went from 1668 to 1642 at the SVTTC Sunday U2000 event from 10 Apr 2016. 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.