This page explains how Tomasz Szacilowski (USATT# 87789)'s rating went from 1262 to 1255 at the Illinois State Championship held on - 15 Dec 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.