This page explains how Mossa Barandao (USATT# 84060)'s rating went from 1555 to 1580 at the 2011 Potomac Spring Open held on - 15 May 2011. 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.