this post was submitted on 29 Jul 2023
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Simple logic twisting really. Ask any guard what other guard would say, negate that answer and you got the right answer.
How though?
A truth B lies
Ask A: answer is No (truth)
Ask B: answers is No (lies)
Let's suppose A always lies and B always tells the truth.
You ask A what B would say this being a correct path. In this case B can't lie and will tell True, A will then lie about that and will say False, you negate False -> True.
Say you ask B what A would say this being a correct path. In this case A always lies and if road is correct they will say False, B who can't lie will tell you A would say False, you negate that -> True.
This assumes A can only lie. But I guess that is the riddl.