This page explains how Rodney Linn Peffer (USATT# 9004)'s rating went from 1800 to 1799 at the MATTC January Open held on - 25 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.