Just wondered if anyone's doing, or done, The Turing Challenge?
https://www.gchq.gov.uk/information/turing-challenge
It's a series of 12 puzzles, each progressively more difficult, to celebrate Alan Turing appearing on the new £50 bank note. I've done the first 6 puzzles but am currently bemused by what's required from the 7th.
I'd be very grateful if anyone could give me a bit of a nudge, but no spoilers please.
Thanks