June 18, 2010

Friday Puzzles #57

Another week, another Masyu puzzle. As promised from last week, this features a novel new trick which you might have missed last week as it wasn’t required in the solve. So whilst I haven’t really had the time to do a juno with it this time round, you will at least have to spot it. Actually I claim it’s a novel new trick, but that’s only to the best of my knowledge.

Additionally this week, I’ve tried to give this total twisted symmetry, but it manages to break down in a couple of places. It turns out that a nikoli.com author by the name of cubic function has simultaneously been incorporating twisted symmetry into his puzzles – including in much larger sizes than mine for a while now too. His designs have perhaps been less striking than mine, and I’ve only picked up on it after solving a second time.

#067 Masyu – rated hard

All puzzles © Tom Collyer 2009-10

Whilst I’m on my soap-box, actually, I read this week that the “world record” for sudoku speed solving has been broken. Now the world record criteria – here denoted as STD-27 – are somewhat arbitrary, presumably to ensure a hard puzzle, but I was the first person to question this, and made a puzzle satisfying world record criteria over a year ago, solvable in the order of 2 minutes. I believe a certain Mr Snyder held that unofficial record. Anyhow, the Czechs have made an even easier puzzle than mine, and the record was broken a total of three times at this event, ultimately by Jakub Ondrousek.

At this point I’d also like to question who the three world sudoku champions featured in that article actually are, bearing in mind that there have been three in total, and only one of them was Czech!

In fairness, if there was such a thing as a meaningful sudoku world record, then you’d probably argue that Jakub O should hold it anyway; so perhaps there is no need for this particular rant…I guess it’s simply the principle of the thing. Jakub O has solved many many sudoku puzzles a lot faster than those particular puzzles!


- 3 comments by 1 or more people Not publicly viewable

  1. stigant

    That was a neat trick, and I’m pretty sure I’ve never seen it before.

    18 Jun 2010, 11:00

  2. I think I may have seen that trick before in a German magazine, in a puzzle labelled ‘very hard’ (read: ‘trial and error needed, logical solution non-existant or impossible to find.’) Certainly, this puzzle was a much better creation.
    Also, this puzzle is 67 not 66, but I think we can forgive you.

    18 Jun 2010, 17:41

  3. A small hiccough with the old copy and paste fro last weeks puzzle – it was originally labelled as an “easy” puzzle haha! :) I’m glad you both enjoyed this. Masyu is one of my very favourite puzzle types – so simple and intuitive and yet so much room for creativity!

    18 Jun 2010, 22:46


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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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AkariFillominoHashiHeyawakeHitoriKakuroLITSMasyuNumberlinkNurikabeRipple EffectShikakuSlitherlinkSudokuSuraromuYajilin.

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