This page explains how Jonathan Vaysman (USATT# 88007)'s rating went from 458 to 421 at the Septemebr Open held on - 29 Sep 2012. 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.