This page explains how Thilina Piyadasa (USATT# 75317)'s rating went from 2550 to 2545 at the California State Open held on - 31 May 2009. 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.