Twenty Questions: A logic puzzle (2000) (icynic.com)

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interactive version

Note that that's for Jim Propp's test, not Don Woods's test (the one that was linked here). (Woods says he was originally inspired by Propp.)

Solved! Thanks, that was a fun hour! :D

dang 10y ago ↗

Url changed from http://www.mathpuzzle.com/20questions.htm to what seems like the canonical source.

kriro 10y ago ↗

Looks like a good Prolog exercise.

Is answering B to everything a valid, low scoring solution, or is it an invalid solution because 20 is not an option for Q19?