This page explains how Peter Gaidarev (USATT# 92458)'s rating went from 1931 to 1921 at the Boston TTC event from 10 Dec 2019. 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.