Chess Grandmaster and arbiter best known for arbitrating the famous encounter between Bobby Fischer and Boris Spassky.
He won the Dresden Chess Championship when he was 15 years old.
He was a highly successful correspondence chess player and at one point it was reputed that he owned the largest known private chess library in the world.
His family owned a publishing company when he was young.
He was the Chief Arbiter when Bobby Fischer defeated Boris Spassky in 1972.