This page explains how Ziggy Rivkin-Fish (USATT# 1166586)'s rating went from 1553 to 1547 at the 2023 Butterfly November Tournament held on 12 Nov 2023 - 12 Nov 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.