This page explains how Derwin Mercer (USATT# 214344)'s rating went from 1618 to 1622 at the 2022 WDCTT May Giant Round Robin held on 14 May 2022 - 15 May 2022. 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.