This page explains how Robert D. Halladay (USATT# 6380)'s rating went from 1271 to 1289 at the City Limits League event from 25 Oct 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.