In February 2017, Beerdsen's IM title was approved during the 9th Batavia Chess Tournament.[3]
In 2020, Beerdsen won the OSBO speed chess tournament, defending his title.[4]
In January 2023, Beerdsen obtained a GM norm at the Tata Steel Chess Tournament.[5] He was one of the only IMs in the Challengers section, and defeated grandmasters Velimir Ivić and Abhimanyu Mishra and fellow Dutch IM Eline Roebers.[6][7][8]
In May 2023, Beerdsen won the Limburg Open Chess Tournament after winning the 7-player tiebreak based on Sonneborn–Berger score.[9][10]
In June 2023, Beerdsen officially met all of the requirements to become a Grandmaster.[11] His title was confirmed and officialized at the end of August 2023.
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