This page explains how Hung Quoc Nguyen (USATT# 42134)'s rating went from 1939 to 1930 at the Long Beach Table Tennis League event from 16 Oct 2010. 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.