This page explains how Jianfeng Song (USATT# 194869)'s rating went from 1721 to 1650 at the Princeton Theological Seminary event from 30 Aug 2010. 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.