Spooks launch tricky quiz to celebrate codebreaker Alan Turing's £50 note – so can YOU crack it?

CODEBREAKERS at GCHQ have published their toughest ever puzzle to celebrate WW2 hero Alan Turing appearing on the new polymer £50 note.

Turing was one of the Bletchley Park boffins who cracked the Nazi’s Enigma code which helped Britain win the war.

But the mega-brain mathematician, played by Benedict Cumberbatch in The Imitation Game, was persecuted for being gay.

Spooks at the government's listening post have published a series of 12 puzzles which they warn will take hours to crack.

Turing took his own life in 1954 after being convicted of gross indecency and forced to undergo chemical castration.

GCHQ chief Jeremy Fleming hailed Turing's appearance on the new £50 note as a “landmark moment in our history”.

The note, which features codes and quotes from Turing, the father of modern computers, will enter circulation on Turing's birthday in June.

“Not only is it a celebration of his scientific genius which helped to shorten the war and influence the technology we still use today, it also confirms his status as one of the most iconic LGBT+ figures in the world,” Fleming said.

“Turing was embraced for his brilliance and persecuted for being gay. His legacy is a reminder of the value of embracing all aspects of diversity, but also the work we still need to do to become truly inclusive,” Fleming added.

Turing is often hailed as Britain's greatest puzzler, but wrote a letter in 1937 in saying: "I am not much use at them"

The spooks have published a series of 12 puzzles based on the banknote’s design.

They said even “experienced puzzlers” will take around seven hours to complete the sequence, known as the Turing Challenge.

A GCHQ codebreaker, who onle gave his name as Colin, a said: “Alan Turing has inspired many recruits over the years to join GCHQ.

“So it seemed only fitting to gather a mix of minds from across our missions to devise a seriously tough puzzle to honour his commemoration on the new fifty pound note.

"It might even have left him scratching his head – although we very much doubt it!”

The spooks, based in Cheltenham, also published puzzles on Christmas cards to other intelligence agencies around the world.

The Bank of England picked Turing from almost 230,000 nominations.

Speaking in 2019, then governor Mark Carney said: "Alan Turing was an outstanding mathematician whose work has had an enormous impact on how we live today.

"Turing is a giant on whose shoulders so many now stand.”

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