This page explains how Sean Patrick O'Neill (USATT# 8840)'s rating went from 2469 to 2475 at the 2003 Decatur Open held on - 16 Aug 2003. 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.