This page explains how Jianfeng Song (USATT# 194869)'s rating went from 1847 to 1838 at the Princeton Theological Seminary event from 1 Aug 2011. 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.