This page explains how Tim Vanzuiden (USATT# 82753)'s rating went from 634 to 633 at the RFD Spring Open held on - 29 Apr 2012. 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.