This page explains how Mark E. Berg (USATT# 6250)'s rating went from 1930 to 1927 at the LYTTC January Open held on - 13 Jan 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.