This page explains how Quan Ni (USATT# 31297)'s rating went from 1558 to 1550 at the 2007 Porky's Fall Classic held on - 28 Oct 2007. 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.