This page explains how Thong Nguyen (USATT# 75212)'s rating went from 1984 to 1964 at the LATTF event from 4 Nov 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.