This page explains how Mark Walker (USATT# 1177042)'s rating went from 1037 to 921 at the 2023 FREMONT BUTTERFLY FEBRUARY OPEN held on 10 Feb 2023 - 11 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.