This page explains how Willem Vandermeulen (USATT# 283319)'s rating went from 1915 to 1840 at the Butterfly Pauli Orr Spring Classic Tournament held on 4 May 2024 - 5 May 2024. 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.