This page explains how M. Genie Sachs (USATT# 16047)'s rating went from 556 to 555 at the Maryland Circuit held on - 11 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.