There once were sixteen chairs. Next to orthogonal. There are people wearing only black or only white.


A black-wearer is in the corner. A white-wearer is next to a black-wearer. At least two white-wearers are next to corners. All wearers are on the edges. Only a few seats are full. They’re a part of the Council of Five, and one is up speaking. One column isn’t used. I believe this narrows it down to only ONE proper configuration, of course, I may be wrong…

Where are our members sitting?

This is a meeting at Nikoli headquarters, by the way.

  • $\begingroup$ ONE MAJOR TAG IS MISSING (would ruin suspense) $\endgroup$
    – user79541
    Oct 28, 2022 at 11:54

1 Answer 1


Based on the "Nikoli headquarters" and tag, this is likely

some puzzle involving black and white circles. And given the "council of 5" tag, there are likely only 5 total clues; the most likely such puzzle that could have a low clue density is a Masyu.

There are still many such solutions, though. Here are a few:

masyu 1 masyu 2 masyu 3

Any reflection of the above would also work.

  • $\begingroup$ At least two white-wearers are next to corners? $\endgroup$
    – Amoz
    Oct 28, 2022 at 12:28
  • $\begingroup$ If "one column is not used" means the, uhm, green part can't pass there either, there are fewer options (although still at least 2, I think). $\endgroup$
    – Jafe
    Oct 28, 2022 at 12:37
  • $\begingroup$ @Amoz Yes, in my images, all three white-wearers are next to corners. $\endgroup$
    – Deusovi
    Oct 28, 2022 at 12:37
  • $\begingroup$ @Jafe Hm, if that's the correct interpretation, I don't see any "proper configurations" - there's no way to control the center well enough to prevent that column from being used. $\endgroup$
    – Deusovi
    Oct 28, 2022 at 12:39
  • 1
    $\begingroup$ Or maybe a better example is this which at least has a unique solution, unlike my above example? $\endgroup$
    – Jafe
    Oct 28, 2022 at 12:46

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