This page explains how Stu Sinykin (USATT# 3841)'s rating went from 1830 to 1800 at the Minnesota Saturday Open event from 16 Feb 2013. 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.