This page explains how Craig Tafel (USATT# 15570)'s rating went from 1188 to 1172 at the Schaumburg $1000 January Open held on - 17 Jan 1998. 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.