[7] In November 2021, Yoo tied for 3rd place at the U.S. Masters Chess Championship with a performance rating of 2604, earning his third GM norm.
[8] On December 12, 2021, Yoo achieved a live FIDE rating of 2500.2 after round 5 of the Marshall Chess Club Championship, fulfilling the last requirement for the Grandmaster title.
In December 2021, Yoo tied for 1st place at the 2021 Charlotte Open alongside Grandmasters Titas Stremavičius, Cemil Can Ali Marandi, Tanguy Ringoir, Robby Kevlishvili, and Akshat Chandra with a performance rating of 2603, earning a fourth GM norm.
[10] In October 2022, Yoo defeated GM Wesley So with the black pieces in the second round of the US Chess Championship in an over 200 point upset.
[11] In October 2024, Yoo was disqualified from the 2024 United States Chess Championship due to code of conduct violations.