This page explains how David S. Chu (USATT# 4872)'s rating went from 1956 to 1909 at the 2006 Stiga NA Tour Finals held on - 22 Oct 2006. 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.