March 25, 2011

Friday Puzzles #97

So something very curious happened this week. This puzzle appeared on nikoli.com.


My unquestionably loyal readers will doubtlessly recall this puzzle as featuring on this very blog back in July 2010:


You don’t need to know what a dihedral group is to recognise that these puzzles are relates by a reflection in the bottom-left/top-right diagonal. I don’t want to go into this too much on the blog – I have initiated a discussion here – but suffice to say I think this is a rather eye-opening coincidence (rather than malicious plagiarism) based on the fact that actually Masyu with twisted symmetry are very highly constrained, and the creative puzzle author might put down the initial diagonal pattern and then finish off the puzzle in exactly the same way as I did.

Anyway, I’m still a little unsure as to what to make of it all, so please feel free to leave a comment either here or in the forum thread.

And so to business. This week’s puzzle is inevitably a Masyu with twisted symmetry. The solve is nothing special, but I hope you’ll agree the design is at least a little striking. Enjoy!

#123 Masyu – rated easy

All puzzles © Tom Collyer 2009-11


- One comment Not publicly viewable

  1. stigant

    Interesting. I’ve heard of that happening in crossword puzzles as well. Not, the whole grid, mind you, but the theme clues for sure, and some of the fill where the constructor is very constrained by odd letters. And again, it happens because theme clues in crossword puzzles tend to be a certain length, and so if two people happen to pick the same theme (many of which are variations on each other anyway, so it’s not unusual to pick the same theme), there’s a good chance their theme clues will be the same.

    25 Mar 2011, 14:44


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Welcome to the blog of current UKPA sudoku champion, two-time Times national sudoku champion and general logic puzzle fan Tom Collyer.



Home of the original Friday Puzzles, each Friday I publish a 100% original and handmade logic puzzle, inspired by the world-famous Nikoli company.


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Latest comments

  • I like the appearance of the solution. :P Nice one. by Prasanna Seshadri on this entry
  • I think I've seen something vaguely similar in some of Palmer's puzzles as well. To be honest I've a… by on this entry
  • That's two puzzles in a row where I find something I had used before. I know, not plagiarism; just g… by Bram on this entry
  • Kota, that's not really true. I had made my puzzle before going to the WPC already. Also I don't hav… by Bram on this entry
  • About 20 minutes, after restarting from a mistaken conclusion. by Bryce Herdt on this entry

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