This page explains how Alla Lantsman (USATT# 212702)'s rating went from 1257 to 1281 at the Trolley Car TTC June 2017 Open held on 3 Jun 2017 - 4 Jun 2017. 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.