This page explains how Olaf Surmann (USATT# 81607)'s rating went from 2145 to 2129 at the 2010 Berkeley Open on the JOOLA NA Tour held on - 5 Sep 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.