ATK oddity

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ATK oddity

Postby Smythe Dakota » Sun Oct 13, 2013 5:14 pm

Has anyone else noticed an apparent oddity in ATK puzzle M43441? The cell r8c5 looks as though it had been pasted there, literally, with scissors and glue. That cell is a bit discolored compared to the rest of the grid, and its borders are less distinct than on other cells.

Additionally, this cell destroys the usual 180-degree rotational symmetry found in most ATK (and other) patterns.

Could it be that the original puzzle was defective (perhaps it had multiple solutions), and that adding this cell (and updating a couple of the sums to match) fixed the problem??

Bill Smythe
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Re: ATK oddity

Postby denis_berthier » Mon Oct 14, 2013 4:12 am

Smythe Dakota wrote:Has anyone else noticed an apparent oddity in ATK puzzle M43441? The cell r8c5 looks as though it had been pasted there, literally, with scissors and glue. That cell is a bit discolored compared to the rest of the grid, and its borders are less distinct than on other cells.


Hi Bill,

On my Mac, I can't see any difference in colour for this cell.

Smythe Dakota wrote:Additionally, this cell destroys the usual 180-degree rotational symmetry found in most ATK (and other) patterns.
Could it be that the original puzzle was defective (perhaps it had multiple solutions), and that adding this cell (and updating a couple of the sums to match) fixed the problem??


I had solved M43442 before and, as mentioned in my post here http://forum.enjoysudoku.com/can-you-solve-this-without-trial-and-error-t30960-181.html, the two are related by sector complementation.
I hadn't noticed the lack of symmetry due to this cell - but I don't use symmetry in resolution. BTW, did you ever use symmetry? (IMO, it's there for purely aesthetic reasons.)
denis_berthier
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Re: ATK oddity

Postby Smythe Dakota » Tue Oct 15, 2013 1:40 am

Hmm, the color difference is gone now (maybe it was an optical illusion due to the difference in the borders) and the difference in the borders is gone too. ATK must have cleaned it up a bit since a day or two ago.

I never use 180-degree rotational symmetry for anything. (For that matter, I don't see how I could use it for anything.) I agree it's purely aesthetic, but lack of symmetry sticks out like a sore thumb and makes me ask questions, I guess. :)

Bill Smythe
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Posts: 525
Joined: 11 February 2006


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