British Chess Champion who also worked as a military code breaker during World War II.
He made his debut in international-class chess at the strong London 1932 tournament.
He competed for Britain in multiple Chess Olympiads including the one in 1939, which coincided with Britain's declaration of war on Germany and led to him abandoning the tournament because of it.
He was born and raised in London, England.
The first international tournament he competed in was won by Alexander Alekhine.