This page explains how John R Gardiner (USATT# 80691)'s rating went from 1300 to 1278 at the PPC 2023 December 2-Person Teams and Giant RR held on 9 Dec 2023 - 10 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.