This page explains how Ari Arratia (USATT# 77064)'s rating went from 1345 to 1345 at the 2010 US Nationals held on - 18 Dec 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.