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8x8 noop with negative numbers https://www.calcudoku.org/forum/viewtopic.php?f=16&t=688 
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Author:  pnm [ Sun Apr 26, 2015 12:20 pm ] 
Post subject:  8x8 noop with negative numbers 
Accidentally created this one: 
Author:  pharosian [ Sun Apr 26, 2015 6:56 pm ] 
Post subject:  Re: 8x8 noop with negative numbers 
4 to 4, I presume? 
Author:  pnm [ Sun Apr 26, 2015 7:46 pm ] 
Post subject:  Re: 8x8 noop with negative numbers 
pharosian wrote: 4 to 4, I presume? 4 to 4, now let me think... 
Author:  pharosian [ Wed Apr 29, 2015 3:26 am ] 
Post subject:  Re: 8x8 noop with negative numbers 
I sense sarcasm there. But really, now that I think a bit more on it, a 4 to 4 puzzle would by 9x9, so what IS the range for this one? Or is figuring that out part of the puzzle? 
Author:  pnm [ Wed Apr 29, 2015 8:43 am ] 
Post subject:  Re: 8x8 noop with negative numbers 
pharosian wrote: But really, now that I think a bit more on it, a 4 to 4 puzzle would by 9x9, so what IS the range for this one? Or is figuring that out part of the puzzle? I'm actually not 100% sure you can figure out the range from the puzzle, but my guess is it should be possible. Edit: looking at the puzzle, it's quite easy, there's a "9" and a given "4". The 4 tells you the smallest possible negative number is 3, etc. 
Author:  nicow [ Wed Apr 29, 2015 11:48 am ] 
Post subject:  Re: 8x8 noop with negative numbers 
I found a solution. Not sure if it is the only one. 
Author:  beaker [ Wed Apr 29, 2015 7:22 pm ] 
Post subject:  Re: 8x8 noop with negative numbers 
Still not sure about the range of numbers used........is it obvious.........like 3 to +4? 
Author:  nicow [ Thu Apr 30, 2015 10:43 am ] 
Post subject:  Re: 8x8 noop with negative numbers 
Yes, Beaker, that is the range I found too. 
Author:  clm [ Thu Apr 30, 2015 11:35 pm ] 
Post subject:  Re: 8x8 noop with negative numbers 
nicow wrote: Yes, Beaker, that is the range I found too. The solution I found is unique with respect to numbers I have considered but not unique with respect to operators, as usual in noops, in fact the cage "0" c1c2d1 admits up to 3 different operators (+, x, :). However I did not try "many" different sets of numbers, continuous of course, since I believe that actually the software is not able to generate puzzles with skipped numbers . 
Author:  pnm [ Fri May 01, 2015 8:43 am ] 
Post subject:  Re: 8x8 noop with negative numbers 
clm wrote: However I did not try "many" different sets of numbers, continuous of course, since I believe that actually the software is not able to generate puzzles with skipped numbers . That is correct. It is the next step for the software, puzzle with arbitrary sets of numbers 
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