This page explains how John Mark Wetzler (USATT# 11058)'s rating went from 2251 to 2256 at the MDTTC Saturday League event from 17 May 2009. 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.