This page explains how Qi Guo (USATT# 80876)'s rating went from 1890 to 1876 at the Trolley Car Table Tennis Club Philly Open February 2012 held on - 12 Feb 2012. 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.