This page explains how Nelson Yamada (USATT# 269784)'s rating went from 1018 to 1027 at the AZ PTTC Monday event from 12 Apr 2021. 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.