This page explains how Jan Gabriel Diemont (USATT# 198498)'s rating went from 430 to 420 at the SVTTC Sunday U2000 event from 21 Nov 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.