This page explains how ILIYAN ARABOV (USATT# 82489)'s rating went from 1233 to 1250 at the B'Nets Fall '09 SGLS.LGE event from 21 Sep 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.