This page explains how Sean Patrick O'Neill (USATT# 8840)'s rating went from 2648 to 2649 at the NTTC February Open held on - 27 Feb 1994. 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.