This page explains how Preston Ha Trun Ha Nguyen (USATT# 29200)'s rating went from 2274 to 2205 at the San Diego/Power Pong Open held on - 8 May 2011. 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.