This page explains how Grigoriy Yasinov (USATT# 30117)'s rating went from 1581 to 1580 at the Maryland State Closed held on - 17 Apr 2004. 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.