How To Solve The Seemingly Impossible Escape Logic Puzzle

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MindYourDecisions
Published at : 27 Jan 2021
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An evil logician takes Alice and Bob captive. They have a chance to escape if they can deduce the total number of trees in the prison. Can they figure it out?

Source of puzzle
wu: riddles forum https://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=riddles_medium;action=display;num=1262868549
xkcd forums http://forums.xkcd.com/viewtopic.php?f=3&t=77401

Blog post: http://wp.me/p6aMk-4wj

UPDATE: It looks like they can actually escape even quicker than I explained! The video is correct, but there are actually a couple of more deductions for an optimal solution. Details here: https://puzzling.stackexchange.com/questions/45664/are-there-eighteen-or-twenty-bars-in-my-castle

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