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The famously difficult green-eyed logic puzzle


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Last Monday I wrote about a riddle involving a bridge, some folks of various bridge-crossing abilities, and a horde of slow-but-blood-thirsty zombies.

Well, Alex Gendler, I’m hooked. I love a good logic problem, and the presentation of these riddles—specifically, the animation and narration—is simply outstanding.

And since I’m hooked, I thought I’d share another in case you’re in (or want to be in) the same boat.

(SPOILER ALERT: The video poses and solves the riddle. Want to think of the “statement” on your own? Stop the video at 1:23. Alternatively, you can watch through to 1:53 if you’d like to know the statement, but leave the how/why to yourself.)

I didn’t immediately think of any extensions to this riddle, but I’d love to hear any you might have dreamed up while working on it.

Side Note

For some reason, I’m reminded of the pirate game, a logic puzzle I first heard during Andrew Stadel’s CMC South talk in 2015.


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