This page explains how Nelson Yamada (USATT# 269784)'s rating went from 1549 to 1543 at the TT&M Friday Night Butterfly League event from 1 Dec 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.