This page explains how Dave Peradotto (USATT# 42747)'s rating went from 1898 to 1857 at the 1996 US Open held on - 7 Jul 1996. 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.