This page explains how Sean Patrick O'Neill (USATT# 8840)'s rating went from 2579 to 2617 at the US Nationals held on - 18 Dec 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.