In January 2016, Admiraal competed in the Challengers section of the Tata Steel Chess Tournament. He managed to hold draws against a number of significantly higher-rated players: Eltaj Safarli, Alexey Dreev, and Liviu-Dieter Nisipeanu.[1]
In July 2018, Admiraal achieved his first GM norm by winning the Andorra Open, where he defeated a number of grandmasters: Alexander Shabalov, Vitaly Kunin, and Christopher Repka.[2]
In February 2019, Admiraal achieved his second GM norm by winning the Cappelle-la-Grande Open tournament with a score of 7.5/9 ahead of grandmasters Sergey Fedorchuk, Namig Guliyev, Maxime Lagarde, and Jules Moussard due to better tiebreak results.[3]
