This page explains how Dennis Norman (USATT# 81196)'s rating went from 1877 to 1889 at the Butterfly MDTTC April Open held on - 7 Apr 2013. 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.