whiteshark: <4040. The code-breakers (C.N.s 4029 & 4034)> From Calle Erlandsson (Lund, Sweden):
‘The mathematician Arne Beurling (1905-1986) worked with the botanist and <correspondence chess grandmaster Åke Lundqvist (1913-2000)> on breaking the Geheimschreiber code. Professor Beurling had already solved several Russian crypto systems in 1939-40. After the occupation of Norway in 1940 the Germans insisted on using the Swedish west-coast cable system for telephone and telegraphic traffic. Sweden naturally made formal protests, but it did mean that Sweden could construct a bugging cable to Stockholm. Beurling and <Lundqvist> understood that there was a machine involved, the Siemens Geheimschreiber, and they eventually broke the code.
Bengt Beckman wrote a book about the code-breaking Swedes, which was also published in English in 2003 by the American Mathematical Society: Codebreakers: Arne Beurling and the Swedish Crypto Program During World War II.
<Lundqvist> played only 87 correspondence chess games in his career (1944-76), with a score of +43 – 12 =32;
he was Swedish correspondence champion in 1945.
He took part in the world championship finals II-IV, finishing fourth, third and eighth respectively.
An obituary of him was published on pages 31-45 of the 6/2000 issue of Korrschack.’
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[I couldn't find a pdf of the obituary. It seems that Korrschack for the years 1999-2008 are not available atm. http://www.schack.se/SSKK/tidskrift... ]