This page explains how Tom Lackaff (USATT# 4387)'s rating went from 1436 to 1452 at the TCTTA Spring Open Double RR held on - 8 Mar 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.