This page explains how Ken Dewhirst (USATT# 52400)'s rating went from 1275 to 1273 at the Pacific Coast Open held on - 29 Aug 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.