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Another side effect generated from the experience :

There is no time limit for flipping the first coin, so if the guard choses the first square, I would wait 1 min before flipping mine. 60th square ? I would wait an hour.

If my friend outside is able to know precisely when I enter / exit from the room, he is able to know the correct square.




Heh. Timing side-channel for the win. :D




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