This page explains how Wallace Ruan (USATT# 221983)'s rating went from 1643 to 1638 at the Alameda Ping Pong Gym Summer Tournament 2023 held on 5 Aug 2023 - 6 Aug 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.