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21 August 2009 @ 01:02 am
Friday Puzzle #11 - Somewhat Clueless Calcudoku  
Writing a lot of puzzles in any one style invariably leads to a lot of ideas for variations in that genre. Here is another variation on calcudoku puzzles that won't fit into my current big project but works fine as a Friday Puzzle here.

Rules: Fill in the grid so that in each row and column the digits 1 through 6 appear once each. While the operations remain in the grid, the numeric values have "fallen" out of the grid and appear below. You will need to figure out where those numbers used to be before you can finish the puzzle.

(Anonymous) on August 21st, 2009 10:22 am (UTC)
What is the definition of a 3-operand-substraction?
motrismotris on August 21st, 2009 03:34 pm (UTC)
Re: Subtraction
I've covered this flaw of the Nextoy KenKen rules in detail here. Basically, as subtraction and division are not commutative and you have to select a larger number for the two-cell case anyway, you proceed to subtract/divide from that largest number when you have any larger number of cells. 5-1-2 = 2- in three cages for example. Its the obvious way to restore some small bit of elegance to the inelegant use of the 4 operations seen in KenKen.
grandpascorpion on August 21st, 2009 01:12 pm (UTC)
Ugh, I give up. I ran into a contradiction the first time through and re-attempted it, trying to be extra careful but again ran into problems.

Oh well. It's probably just me.
Adam R. Woodzotmeister on August 21st, 2009 05:35 pm (UTC)
I'm afraid it is. I have two suggestions. The first is to make sure you're not mixing up the plus signs, minus signs, and obeli [that may be the only chance I ever get to use that word in a proper context]. The second is to try again later. Not right away, but after a while. Minds fluctuate. This is worth solving, so keep coming back to it until you get it - that's my advice. - ZM
grandpascorpion on August 21st, 2009 07:06 pm (UTC)
Oh, definitely. It's a great, novel premise. I'll try it again soon.

I got about 3/4 of the way through each time before reaching an impasse.
Adam R. Woodzotmeister on August 21st, 2009 05:28 pm (UTC)
This is utterly fantastic, Thomas. I don't know how you came up with the interactions in this puzzle, especially [between the division region in the bottom-right corner and the subtraction region to its left], but it's all kosher deductive logic. Thank you greatly for this exercise. - ZM
motrismotris on August 21st, 2009 05:49 pm (UTC)
While I eventually abandoned the symmetry in the grid for the Fibonacci series theme as a way to get the rest of it to work, my construction did start with
that bottom row forcing the interesting interactions in the bottom-right. I think I've been thinking too much recently about my introduction to division for the book, so the limitations of 5 versus 4 triggered the deductions I put in there. After that, there is a small assignment question between a 3 or a 5 in the upper-left that gets resolved when you consider the two singletons in the middle, but the big hurdle is already done.
grandpascorpion on August 21st, 2009 09:15 pm (UTC)
Finally got it
Was it by chance that you posted this on 8/21? I loved the Fibonacci theme as well.
(Anonymous) on August 21st, 2009 08:53 pm (UTC)
I'll second that - the sheer range and variety of logic you need to put in to solve this is pretty neat for a 6x6 puzzle. A polished puzzle as per usual - a good benchmark to aim for!

cyrebjrcyrebjr on August 21st, 2009 07:32 pm (UTC)
Unnumbered regions, Fibonacci sequence... are you winking at me?
carljohanr on August 22nd, 2009 07:13 am (UTC)
Nice puzzle!
Really nice puzzle this week - looking forward to more similar ones!
Robert Hutchinsonertchin on August 24th, 2009 03:14 am (UTC)
I didn't even notice the Fibonacciness of the numerical clues until I read the comments.

I tend to "write" notes on the outside of the grid, and I had to be careful to keep the 1-6 digit possibles separate from the clue possibles. No goof-ups, though. Very nice puzzle.
thesubro on September 13th, 2009 12:33 pm (UTC)
I am late to your Friday Puzzles, and just started this one last night and finished this morning and loved every minute of it, as I knew that if I kept plugging away it would unpeel.

Thanx for the continued enjoyment from these personal puzzles.



p.s. How many could have created it? ... how many could have solved it? How wonderful for both.

motrismotris on September 13th, 2009 03:05 pm (UTC)
Can I add you to my list of people name Ken who prefer my puzzles to KenKen ;)? Glad you enjoyed it.
(Anonymous) on September 10th, 2010 03:49 am (UTC)
I looooooooooove this one!!!
Cool entrance,
beautiful use of the two single boxes,
and simmetric fibonatti clues.