shminux comments on Apply your knowledge: pick half a number - Less Wrong
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Actually, a sizable fraction of clever pranksters may get a kick out of thwarting the "rational" choice, since there is no punishment for guessing wrong, and pick 100.
(No, I am not telling you what I picked.)
This thought did occur to me, yes. But I figured the "rational" choice - which is not actually rational, since it's predictably not going to win - of zero was doomed anyway, so chose 1 rather than guarantee a loss with 100 for no purpose.
Edit: Oh. There's nothing preventing you from voting multiple times. Hmm... in that case 49 is probably the best bet.
Every time I've played this in real life there's been someone who's done that.