This page explains how David Maisel (USATT# 76188)'s rating went from 1642 to 1619 at the MATTBC Open held on - 16 Nov 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.