This page explains how Richard S. K. Dong (USATT# 31650)'s rating went from 1287 to 1269 at the John Jorgensen League event from 15 May 2005. 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.