This page explains how Irina Hellwig (USATT# 11612)'s rating went from 1550 to 1530 at the Sacramento Winter Open held on - 18 Jan 1997. 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.