This page explains how William Chen (USATT# 264251)'s rating went from 1127 to 1007 at the 2023 SPTTC October Open & Washington Championships held on 21 Oct 2023 - 22 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.