This page explains how Johnny Yam (USATT# 74934)'s rating went from 1560 to 1561 at the PTTC Saturday League event from 12 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.