Clarke began playing chess at age 8, and has represented England in European & World Chess Championships.[1]
Clarke has won the 2006 and 2007 London U12 championships.[2] In 2012, he won the UK Chess Challenge.
In January 2019, Clarke won the 126th New Zealand Open ahead of Timur Gareyev and Darryl Johansen.[2] He then won the 2019 FIDE Open.[3]
In April 2022, Clarke had the best result for England in the Reykjavik Open.[4]
In August 2023, Clarke participated in the Major Open tournament of the British Chess Championship, where he found a cross-pin move against Kajus Mikalajunas.[5]