This page explains how Chi-Sun Chui (USATT# 4879)'s rating went from 2390 to 2389 at the San Fransisco Summer Open held on - 21 Aug 1994. 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.