This page explains how Tim Vanzuiden (USATT# 82753)'s rating went from 632 to 634 at the Rockford Thanksgiving Open held on - 20 Nov 2011. 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.