This page explains how John Zydell (USATT# 24233)'s rating went from 1633 to 1613 at the 2005 Eastern Open/Zhi Yu Cup held on - 24 Jul 2005. 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.