This page explains how Lidney Mazzeo Castro (USATT# 216598)'s rating went from 2488 to 2487 at the 2017 Alameda Spring Open held on 8 Apr 2017 - 9 Apr 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.