This page explains how Janis Witte (USATT# 89268)'s rating went from 1855 to 1854 at the Westchester 2012 October Open held on - 21 Oct 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.