This page explains how Percy Johnson (USATT# 220565)'s rating went from 1131 to 1031 at the 2018 Minnesota Open held on 14 Apr 2018 - 21 Apr 2018. 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.