This page explains how Richard R. Mercado (USATT# 20058)'s rating went from 1678 to 1620 at the California State Open held on - 23 Jun 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.