This page explains how John Mar (USATT# 5185)'s rating went from 2275 to 2289 at the 2011 Decatur Open held on - 20 Aug 2011. 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.