This page explains how Guido Schnabel (USATT# 73730)'s rating went from 1937 to 1938 at the Atlanta Giant RR held on - 30 May 2009. 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.