This page explains how Harriet R. Brin (USATT# 18066)'s rating went from 1090 to 1068 at the 2010 US Nationals held on - 18 Dec 2010. 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.