This page explains how Jianfeng Song (USATT# 194869)'s rating went from 2051 to 2047 at the Princeton Pong Leagues event from 20 Feb 2018. 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.