This page explains how Daniel Vogt (USATT# 23871)'s rating went from 1266 to 1239 at the Boston TTC January Open held on - 6 Jan 2002. 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.