This page explains how Xinyin Zhang (USATT# 280322)'s rating went from 451 to 437 at the Spttc Saturday Junior League event from 7 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.