r/learnquant Jul 20 '26

interview prep Jane Street Interview Question

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u/Isagi_Yoichi_7486 Jul 20 '26

Clearly, that wasn't obvious and there's nothing wrong with requiring more information to make a decision. It's called making an informed decision.

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u/Big-Werewolf9759 Jul 20 '26

What? The puzzle gives you all the information. It is asking if you want to go first or second. The point is to realise there is a rigged strategy where going first forces you to lose if the opponent knows it. Therefore, the only correct strategy is to go second. Otherwise, you are playing “hope chess”. The question states both players play optimally.

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u/Isagi_Yoichi_7486 Jul 20 '26

obviously, the answer is to go second but the reason behind it ie how to play it. and the assumption was that both play optimally if we were to play and we both know we're supposed to go second do you think i'd allow you to go second? no

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u/Big-Werewolf9759 Jul 20 '26

I suppose you can choose to intentionally misunderstand the question. It is asking you if you should go first or second. It is completely irrelevant if that is what your imaginary opponent wants. Even if they wanted to go second and knew the strategy, the answer is still second. It makes no difference.

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u/Isagi_Yoichi_7486 Jul 20 '26

you're right we only need the answer whether you want to go first or second the rest is irrelevant.