This page explains how Simon Shtofmakher (USATT# 9997)'s rating went from 2121 to 2125 at the Westfield December Open held on - 13 Dec 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.