This page explains how Jeff Nguyen (USATT# 74947)'s rating went from 1133 to 1223 at the 2009 TX Winter Games held on - 17 Jan 2009. 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.