This page explains how David Roberts (USATT# 55604)'s rating went from 2212 to 2171 at the Silicon Valley Championships held on 18 Feb 2023 - 20 Feb 2023. 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.