This page explains how Michael Minh Tran (USATT# 80507)'s rating went from 1900 to 1891 at the 2011 US Nationals held on - 17 Dec 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.