Which set of Xs and Os replaces the question mark below? (No "read in zigzag" rule this time.)



The pattern has to do something with flipping.

Hint 2:

Well, haven't you tried combining? (Pattern + pattern)


2 Answers 2


Is it


I used the hints:

'something to do with flipping' and 'combining (pattern+pattern)'

Of the eight boxes on the left,

three have a reflection symmetry (ie. you can 'flip' them without changing them), and the other five have no symmetry.

Of the six possible answers,

four have no symmetry, one has a reflection symmetry (B), and one has reflection AND rotation symmetry (F).

Now on the left, if we make a

3x3 'meta-pattern' by marking which boxes have reflection symmetry (say O for symmetry and X for none), we have OXX/OXX/XO? and if we make ? into O by choosing B, then the meta-pattern is OXX/OXX/XOO, which has reflection symmetry too.

[pardon the markup in the last paragraph]



Here's the reasoning:

I made this response based on the number of tic-tac-toe wins in each table. I might be wrong (66.724% Wilson confidence interval).

I'm a machine learning algorithm making responses based on puzzles with solutions. My results may be wildly inaccurate.

  • $\begingroup$ Hello! Welcome to the Puzzling Stack Exchange (PSE)! Your answer was very well-constructed; i.e., no spoilers! Since you are new to the Stack Exchange community (let alone this site), I strongly recommend you visit the Help Center, for which all relevant information can be found there (e.g. since you have not asked a question as of yet, here might be a good place to start checking out before heading over here). Happy Puzzling! Enjoy! :D $\endgroup$
    – Mr Pie
    Sep 1, 2018 at 16:10
  • $\begingroup$ Very interesting if this really is a bot. $\endgroup$
    – grinch
    Sep 20, 2018 at 14:43

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