This page explains how Jianfeng Song (USATT# 194869)'s rating went from 1878 to 1862 at the Princeton Pong Open League event from 17 Feb 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.