coverFirst, an important announcement.  Last week I had an email from Psychology class 13B.  Each week their fab teacher, Mrs Roo, encourages them to do the Friday Puzzle.  However, Mrs Roo is leaving this week and so they wanted to say…..‘Goodbye Mrs Roo, we will miss you! Love from 13B’!

OK, to the puzzle.  As ever, please do NOT post your answers, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.

How many squares are there on an 8 x 8 chessboard?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UKhere and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.


  1. I thought I had it, I just thought that’s easy.
    I start scrolling and see “Do you make assumptions?”

    Well played Richard, well played.

    1. I’m not a psychology professor, I was thinking more of the owner of this blog

      and no, I don’t think it is relevant, you were clearly still eager to post a solution

  2. I was just going to moan how you are clever enough to work out the answer but not clever enough to read the instructions of not posting the answer, but Richard has not put that bit in this week, so instead I wish you a very merry Christmas!

  3. Got it, and if my clock works it took about 4 minutes, and yes, anonymous is wrong (and an idiot for trying to publish the answer)

  4. Rats. Anonymous is wrong. And I don’t know why; so some smartypants can tell us next week. Please don’t tell us before anyone else!!!

    I was all pleased with myself for working it out. I was going to say that it took me 10 minutes. But now I won’t as I’ll look like an idiot for getting it wrong too! 😀 😀 😀

    And Anonymous: 😦 revealing your answer early.

  5. About a minute working it out, then realizing the pattern.
    But looking at some of the other comments, I’m not so sure now…

  6. In my wold a chess board has only black squares on a white background…. and there two diagonally adjacent squares make no new square…
    so my answer would be the nubmer of the black fields in a chessboard…
    (and as i assume that this is not the answer Mr. Wiseman had im mind, i do not feel like posting “the answer”)

    1. In my world, the comments page is only black letters on a white background. The letters exist, but the page does not, and neither does your comment.

  7. I find the fun of the puzzle is to figure it out yourself, and to read the comments afterwards, as even reading a comment saying “1 minute” makes me see the answer quicker – human nature and competition I guess. Still anonymous certainly fails for not following instructions! Anyway took a few minutes to figure out the method, and a few more to find some paper for the sums.

    1. I agree, if you know the answer is quickly solvable, it becomes quickly solvable. Weird, but I think it’s because you search a simple solution space rather than fret over having to come up with some ingenious or fiendishly complicated piece of reasoning.

  8. It’s been a while since there was a puzzle to commute by, thanks for another, I counted them on the train.
    Condiments of the seasoning!

    1. This is a very clever post, children, because 3′ 24″ is 204″ and 204 is the correct answer to the question.
      When you are grown up you will be able to display your erudition in this way too, my little ones.

    1. I almost get the impression that telling people to not reveal the answer makes them more eager to do so. Something for a psychology professor to investigate perhaps?

    2. Would it help your psychoanalysis, Anders, to know I had no idea whatsoever of what the answer was when I posted my soi-disant “spoiler”

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