This page explains how David R. Zapatka (USATT# 11394)'s rating went from 1561 to 1534 at the Best of the West Open held on - 13 Jun 2004. 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.