Around 1993, Jim Propp invented the
"Self-Referential Aptitude Test",
or short SRAT.
This quiz is intesting
because almost all of its questions are about the
And here the
Some remarks on the riddle:
The fact that only one choice point is needed
nicely reflects the intention of the author
that "the solution should be found without too
much trial and error" (private communication
with Jim Propp).
We assumed the answer to question 20 to be E.
If the answer to the last question is left open,
there are 4 solutions.
The solution is still unique, when
the information in questions 7, 10, 12, 13, 16 and 17 is
not used. However, not using these questions makes
the problem considerably harder: with the same
search strategy, 19 choice points are required.
Using Oz, we came up with several
other puzzles of the S.R.A.T. kind.
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