This page explains how Nelson Yamada (USATT# 269784)'s rating went from 1565 to 1561 at the AZ PTTC Monday event from 20 Mar 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.