Letter reveals Alan Turing’s advice to gambling friend for Monte Carlo casinos

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He was the mathematical genius whose code-breaking work at Bletchley Park played a crucial role in defeating the Nazis in the Second World War.

But before he turned his mind to cracking the ciphers of the German navy, Alan Turing had a more intriguing question to address: how to break the bank at Monte Carlo.

Turing was a 21-year-old undergraduate at King’s College, Cambridge when the father of a school friend told him of his past life as a gambler.

Alfred Beuttell, the strip lighting inventor who founded the company Linolite, told the young Turing how he had devised his own Monte Carlo method of playing roulette, and managed to live off his winnings for a month on the French Riviera.