This page explains how Mark Johnson (USATT# 26863)'s rating went from 1646 to 1508 at the SVTTC Sunday U2000 event from 28 Jun 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.