This page explains how Keir Armstrong (USATT# 280537)'s rating went from n/a to 438 at the PPC 2023 Fall Open held on 7 Oct 2023 - 8 Oct 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.