[2] In July 2017, Tiglon won a Gold Medal at the 2017 North American Youth (U18) Chess Championships and was awarded the International Master (IM) title.
[3] In August of the same year, Tiglon tied for first at the prestigious GM Arnold Denker National Tournament of High School State Champions.
[4] In November 2018, Tiglon earned his first GM norm by winning the 2018 North American Junior (U20) Chess Championships held in Baja California, Mexico.
[5][6] In March 2019, Tiglon won the National High School Blitz Tournament with a near-perfect score of 11.5/12, only drawing against Joseph Wan in the final round.
[8] In November 2023, Tiglon earned his second GM norm by tying for first place in the U.S. Masters Chess Championship with Mikhail Antipov, Gleb Dudin, and Justin Wang, finishing ahead of 39 out of 40 grandmasters in the event.