This page explains how John Mar (USATT# 5185)'s rating went from 2230 to 2218 at the 2004 Spin Open held on - 29 Feb 2004. 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.