This page explains how Marvin Plevinsky (USATT# 9114)'s rating went from 1966 to 1948 at the '97 Penna State Closed held on - 25 Apr 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.