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Dominic Rougier wrote:For inspiration: (and this is very summarised, so apologies)
Bob Cassidy has a wonderful logic puzzle with this fisherman's girl, and two coloured stones in a bag, one black and one white.
There's an evil landowner who wants to "marry" the girl, who the fisherman needs to deal with. He proposes a challenge - she draws one stone out of this bag, if it's white she escapes, if it's black she goes with him.
But she knows he's going to cheat - she knows there will be two black stones in the bag.
She needs to draw a white stone from a bag containing two black stones.
So how does she get out of it?
She meets him on the beach, reaches into the bag and draws out one of the stones in her fist. She slips, fumbles, and drops the stone among all the other stones on the beach...
She says how they'll never know which stone she picked, but they can tell by which stone is left... the bag is opened and a black stone remains - ergo she must have chosen the white stone...
"Impossibility is only a perception"
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