This page explains how Richard S. K. Dong (USATT# 31650)'s rating went from 1300 to 1287 at the John Jorgensen League event from 2 Jan 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.