This page explains how Isaac Keren (USATT# 20105)'s rating went from 1837 to 1849 at the 2021 US National TT Championships Ohio State Qualifier held on 6 Mar 2021 - 3 Apr 2021. 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.