This page explains how ILIYAN ARABOV (USATT# 82489)'s rating went from 1270 to 1280 at the B'Nets Fall '09 SGLS.LGE event from 2 Nov 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.