This page explains how Ryan Dabbs (USATT# 89506)'s rating went from 1969 to 1947 at the MDTTC Saturday League event from 1 Feb 2015. 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.