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| drhickman
| | Joined: 19 Apr 2006 | | Posts: 2 | | : | | Location: Midwest |
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 Posted: Wed Apr 19, 2006 3:25 am Post subject: The Sudoku program gives the wrong hint? |
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Consider the following puzzle:
*-----------*
|.2.|7..|.8.|
|6..|...|5.3|
|.9.|3..|...|
|---+---+---|
|...|.4.|3.6|
|...|6.5|...|
|7.4|.1.|...|
|---+---+---|
|...|..4|.7.|
|5.2|...|..9|
|.1.|..9|.2.|
*-----------*
Reaching the following position, the program gives a hint that says there are locked candidate(s) and highlights 189 and 1839 (see the asterisks below) but there is no way to determine which of the 9s is to be "made". This is using the current version 4.1z. I can of course try either of the 9s and once the correct 9 is made then the puzzle collapses easily. Why is the hint incorrect?
*-----------*
|.2.|7..|.8.|
|67.|4.2|5.3|
|49.|3..|.6.|
|---+---+---|
|.5.|.47|3.6|
|...|6.5|.4.|
|764|.13|.5.|
|---+---+---|
|9.6|..4|.7.|
|542|.7.|.39|
|.17|..9|.2.|
*-----------*
*--------------------------------------------------------------------*
| 13 2 135 | 7 569 16 | 149 8 14 |
| 6 7 18 | 4 89 2 | 5 19 3 |
| 4 9 158 | 3 58 18 | 27 6 27 |
|----------------------+----------------------+----------------------|
| 128 5 189* | 289 4 7 | 3 19 6 |
| 1238 38 1389* | 6 28 5 | 12789 4 1278 |
| 7 6 4 | 289 1 3 | 289 5 28 |
|----------------------+----------------------+----------------------|
| 9 38 6 | 1258 238 4 | 18 7 158 |
| 5 4 2 | 18 7 68 | 168 3 9 |
| 38 1 7 | 58 368 9 | 468 2 458 |
*--------------------------------------------------------------------*
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| angusj
Site Admin
 | | Joined: 18 Jun 2005 | | Posts: 406 | | : | |
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| Posted: Wed Apr 19, 2006 7:15 am Post subject: Re: The Sudoku program gives the wrong hint? |
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| drhickman wrote: | | Why is the hint incorrect? |
The hint isn't wrong.
Somehow, you've mistakenly presumed that the filtering is on the 9 digit. If you look at the filter buttons along the top of Simple Sudoku you'll notice that the 8 filter button is depressed, not the 9 filter button. Consequently, the hint is correctly indicating that the 8 candidates in the highlighted cells can be removed. |
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| drhickman
| | Joined: 19 Apr 2006 | | Posts: 2 | | : | | Location: Midwest |
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| Posted: Fri Apr 21, 2006 5:54 pm Post subject: Wrong hint? |
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Sorry, I figured out my mistake a few moments after posting. I apologize for the wasted time, etc.
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| angusj
Site Admin
| | Joined: 18 Jun 2005 | | Posts: 406 | | : | |
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| Posted: Fri Apr 21, 2006 10:45 pm Post subject: Re: Wrong hint? |
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| drhickman wrote: | | Sorry, I figured out my mistake a few moments after posting. I apologize for the wasted time, etc. |
No problem. Glad you figured it out.  |
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