Now it's your turn. B. So of the two options you have at the time you choose, taking both boxes will always give you a better payoff. But if you're the kind of person who would reason that way, and take both boxes on that basis, the being knew that, and left box B empty, so you lose the million. Probably anyone who knows you well would have a fair chance of working it out, even without being able literally to see inside your brain. A person's choice on this is not based on a whim, it stems from deep, enduring attitudes.
Determinists count themselves lucky to be in the second set.
In the normal Prisoner's Dilemma, two criminals are arrested and questioned separately. The catch is that neither knows what the other is saying. A judge tells Steve that he will be hanged one day the next week, and that he will not be able to know beforehand what day he will be hanged on. Steve thinks he has proved the judge wrong. But given that fact, if at the end of Friday I haven't been hanged, I'll know I will be hanged Saturday, which again is against the decree that I not know which day it will be.