Sunday, 23 May 2010

Friday Puzzles #47

Ooooh – a Sunday. Looking at the time, I think I’m currently drinking myself into oblivion. I’m hoping that this time I can keep myself away from the gin. Gin always gives you one hell of a hangover, and bearing in mind I’m due to be playing cricket later today that’s one thing I could be doing without.

But what better than a drunken puzzle to liven up any party!? Especially one as tricky as this Heyawake. Some careful thinking is required here to avoid tripping yourself up; indeed, that’s why I had to unfortunately break the symmetry of this puzzle to make sure everything was above board. Still, the solve itself was well worth tinkering with to get right, and so that’s why this one gets to be published. Enjoy!
    #057 Heyawake – rated hard
All puzzles © Tom Collyer 2009-10

P.S. Incidentally, I thought the Hitori yesterday was harder than this puzzle – but a very helpful testing session with this puzzle has probably changed my mind. Thanks Agnieszka!

Saturday, 22 May 2010

Friday Puzzles #46

So my attempt to get my numbering back up to where it should be continues.

I was originally going to stick this hitori puzzle in yesterday – it is a much superior puzzle to Friday’s – but I felt it wouldn’t be doing this puzzle justice. I want to talk about this a little bit and that seemed out of place with yesterday’s nostalgic waffle. Suffice to say, some of the logic is quite involved in this puzzle, but what really interested me whilst constructing this puzzle was the whole idea of having so-called “minimal hitori”. The thinking here is that if the numbers in the grid which at no stage feature in any meaningful deduction weren’t even printed in then it might make for a puzzle with a nicer solving flow.

Being the sadistic contrarian that I am, I’ve decided to take a different approach. Most nikoli.com hitori usually feature an “ascending solve” – that is the first deduction will usually be with 1’s, then 2’s and so on. This is true of this puzzle – however what I’ve tried to do with superfluous clues is to disguise them (albeit on a fairly superficial level) amongst what you should really be looking for. Let me reiterate again, this is a tough solve.

Instead of writing “Sorry, Thomas”, I’ll instead go with “Sorry Thomas”. Or perhaps that should simply be: “Enjoy!” :)
    #056 Hitori – rated hard
All puzzles © Tom Collyer 2009-10

Friday, 21 May 2010

Friday Puzzles #45

It’s funny how quickly a year goes by. It came to my attention this week that actually today’s entry marks the one year anniversary of my Friday Puzzle series. Reading back over the original entry, I’m not sure how successful I’ve been in this not being a massively Sudoku dominated thing – I guess I stick to what I know best and there have been a good chunk of Sudoku or Sudoku variants posted on this blog over the past year. On the other hand, the other two main players have been two puzzles which I really do enjoy – Masyu and Nurikabe – and I hope that I’ve introduced readers into some of the flavours of these two wonderful puzzles.

Now, the eagle-eyed amongst you will notice that 45 is by no means equal to 53, which is the number I ought to be on had Friday Puzzles actually happened on a weekly basis. Alas, various factors have meant that this isn’t the case – not least the break I took at the end of the year. In that post, I recapped on what had been my favourite puzzles so far. I feel obliged to add to that list since then, as there have been a couple of beauties, in my opinion:
  • Week 38: Arrow SudokuOK I’ve seen nicer examples of Arrow Sudoku than this, most notably the WSC puzzle upon which I was moved to write “a thing of beauty” on the page, but this certainly has an interesting visual appeal together with a satisfying solve.
  • Week 34: Masyu – probably the most elegant masyu puzzle I’ll ever write.
  • Week 32: Killer Sudoku – a killer with more than a taste of kakuro, and definitely no cage addition.
  • Week 31: Sudoku – I link directly to this puzzle rather than the blog post, as the excellence of this puzzle was somewhat overshadowed by a more controversial puzzle published simultaneously. [The offence caused was perhaps something I’m not overly proud of now, but I still stand by it given the personal context]. Anyhow, I don’t want to do any more overshadowing here, so be assured that this puzzle is a good’un.
And for the sake of posterity, here are the previous picks once more:
Anyhow, returning to my indexing quandry, I have decided that this week I shall release a “Friday” puzzle daily, until I get up to #52 next week – which should be #54 – and then another two the following week until in two weeks time I should be on course for #55. I might even look at filling in that missing double-toroidal Sudoku I completely forgot about in Week 7; although perhaps the complete absence of Week 17 will be harder to overcome…

I’ve got this far into the anniversary post, without referring to my almost famous off-shoot and pretender to the crown of being the Tom with the original Friday Puzzles series. I’ve hopefully mentioned Thomas Snyder’s blog enough times for regular readers to be familiar with it, but if for some reason you aren’t, you should definitely take the time to have a look – suffice to say there aren’t too many people on this planet like Mr Snyder. Anyhow, in a recent revelation, it turns out he doesn’t much like hitori. Or maybe he does.

Actually, I like to think that last entry was at least in some part induced by a provocative comment I left on nikoli.com, but who knows. This week’s inspiration goes with the whole hitori thing, and today’s puzzle is the warm-up to tomorrow’s full-blooded affair. So not a massively amazing puzzle for the one year anniversary, but hopefully the coming week will make up for it. Enjoy – and thanks to each of my 3,043 unique visitors (since last September when I got Google analytics up and running) for sticking with me so far! :)
    #055 Hitori – rated medium
All puzzles © Tom Collyer 2009-10

Thursday, 13 May 2010

Friday Puzzles #44

One of the comments about some of my Friday Puzzles that I hear from seasoned puzzlers is that they are a touch on the easy side. I have said before part of my aim is to put out puzzles that are primarily friendly to a more general audience. This softly softly approach has the advantage of letting me put out more polished puzzles – the thinking being that as a puzzle writer the time to master quick and easy techniques onto my puzzles is quicker than trying to do a juno.

On the other hand, it has been tempting to flex my muscles a bit, and there have been a couple of puzzles I have released together with a comment along the lines of “expect a similar puzzle in a bigger and better format later”; only for that puzzle never to materialise.

Well, this changes this week – regular readers will no doubt spot the similarities with a previously released puzzle. Here is a nikoli large sized masyu puzzle. Apart from the end being a bit fiddly, I think this is as good a puzzle as I’ve ever written, and I hope you – most dearest of readers – think the same. Enjoy!
    #054 Masyu – rated hard
All puzzles © Tom Collyer 2009-10

Friday, 7 May 2010

Friday Puzzles #43

OK – I’m in a little bit of a rush so here’s a masyu with nearly twisted-symmetry. Hopefully I’ve not left out any clues (or put in any extra ones), I think this one is good. No more sudoku here for a while. :)
   #053 Masyu – rated easy
All puzzles © Tom Collyer 2009-10

PS Expect some sort of a WSC write-up soon

PPS Tip from the top – staying up all night watching an election is not a good way to shake off jet lag. Haha…

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