This page explains how Sean Patrick O'Neill (USATT# 8840)'s rating went from 2569 to 2556 at the 1996 US Olympic Trials held on - 23 Feb 1996. 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.