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| jswafa
| | Joined: 25 Mar 2009 | | Posts: 3 | | : | |
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 Posted: Wed Mar 25, 2009 1:32 am Post subject: Problem with Simple Sudoku? |
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Can anyone explain why this Simple Sudoku puzzle doesn't show a 5 possible in 7,2?
| Code: | *-----------*
|3..|.6.|.9.|
|.4.|3..|...|
|..7|.54|3..|
|---+---+---|
|..5|..8|..1|
|2.4|...|9.7|
|8..|2..|4..|
|---+---+---|
|..9|18.|7..|
|...|..2|.5.|
|.2.|.3.|..8|
*-----------*
*-----------*
|3.2|.6.|.94|
|.4.|32.|.76|
|..7|.54|312|
|---+---+---|
|..5|..8|2.1|
|2.4|.1.|987|
|8..|2..|4.5|
|---+---+---|
|4.9|18.|723|
|...|..2|.59|
|.2.|.3.|.48|
*-----------*
*--------------------------------------------------------------------*
| 3 158 2 | 78 6 17 | 58 9 4 |
| 159 4 18 | 3 2 19 | 8 7 6 |
| 69 689 7 | 89 5 4 | 3 1 2 |
|----------------------+----------------------+----------------------|
| 679 3679 5 | 4679 479 8 | 2 36 1 |
| 2 36 4 | 56 1 356 | 9 8 7 |
| 8 13679 136 | 2 79 3679 | 4 36 5 |
|----------------------+----------------------+----------------------|
| 4 56 9 | 1 8 56 | 7 2 3 |
| 167 13678 1368 | 467 47 2 | 16 5 9 |
| 57 2 16 | 579 3 579 | 16 4 8 |
*--------------------------------------------------------------------* |
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| daj95376
| | Joined: 05 Feb 2006 | | Posts: 349 | | : | |
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| Posted: Wed Mar 25, 2009 10:46 am Post subject: Re: Problem with Simple Sudoku? |
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[Withdrawn: misunderstood cell being referenced.]
Last edited by daj95376 on Wed Mar 25, 2009 5:05 pm; edited 1 time in total |
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| jswafa
| | Joined: 25 Mar 2009 | | Posts: 3 | | : | |
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| Posted: Wed Mar 25, 2009 3:59 pm Post subject: Re: Problem with Simple Sudoku? |
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| Sorry - I was asking about R2, C7 - as far as I can tell it should show a 5 possible. All "show" options are selected.[/quote] |
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| daj95376
| | Joined: 05 Feb 2006 | | Posts: 349 | | : | |
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| Posted: Wed Mar 25, 2009 5:15 pm Post subject: Re: Problem with Simple Sudoku? |
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| jswafa wrote: | | Sorry - I was asking about R2, C7 - as far as I can tell it should show a 5 possible. All "show" options are selected. |
It would appear that SS thought you eliminated 5 from r2c7. The only way to know for sure is if you saved the puzzle to a .ss file before exiting. Then the file can be opened and the eliminations list reviewed.
Note: There is a tiny bug in SS when loading a PM. If it encounters a cell with only one candidate, then it treats it as a given and performs eliminations of that value in all peer cells. This will happen if anyone tries to load your PM into SS. This means that the PM you listed won't look the same after it's used as input to SS.
| Code: | Your PM
*--------------------------------------------------------------------*
| 3 158 2 | 78 6 17 | 58 9 4 |
| 159 4 18 | 3 2 19 | 8 7 6 |
| 69 689 7 | 89 5 4 | 3 1 2 |
|----------------------+----------------------+----------------------|
| 679 3679 5 | 4679 479 8 | 2 36 1 |
| 2 36 4 | 56 1 356 | 9 8 7 |
| 8 13679 136 | 2 79 3679 | 4 36 5 |
|----------------------+----------------------+----------------------|
| 4 56 9 | 1 8 56 | 7 2 3 |
| 167 13678 1368 | 467 47 2 | 16 5 9 |
| 57 2 16 | 579 3 579 | 16 4 8 |
*--------------------------------------------------------------------*
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| Code: | After reloading into Simple Sudoku
*--------------------------------------------------------------------*
| 3 158 2 | 78 6 17 | 5 9 4 |
| 159 4 1 | 3 2 19 | 8 7 6 |
| 69 689 7 | 89 5 4 | 3 1 2 |
|----------------------+----------------------+----------------------|
| 679 3679 5 | 4679 479 8 | 2 36 1 |
| 2 36 4 | 56 1 356 | 9 8 7 |
| 8 13679 136 | 2 79 3679 | 4 36 5 |
|----------------------+----------------------+----------------------|
| 4 56 9 | 1 8 56 | 7 2 3 |
| 167 13678 1368 | 467 47 2 | 16 5 9 |
| 57 2 16 | 579 3 579 | 16 4 8 |
*--------------------------------------------------------------------*
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Note: Cells r1c7,r2c2 were cleared of 8 once cell r2c7 was reached during loading; but, since these cells have already been processed during loading, they're not treated as a given.
Final Note: If a PM is invalid but the "givens" lead to a valid solution, then SS won't realize that there's a problem with the PM. This does not apply to your PM, but it's worth noting if you load a PM from another source or have Block Invalid Moves unchecked on any PM you create. |
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| angusj
Site Admin
 | | Joined: 18 Jun 2005 | | Posts: 406 | | : | |
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| Posted: Wed Mar 25, 2009 9:36 pm Post subject: Re: Problem with Simple Sudoku? |
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| jswafa wrote: | | Sorry - I was asking about R2, C7 - as far as I can tell it should show a 5 possible. All "show" options are selected. |
You almost certainly (inadvertently) removed that candidate. A careful look at your solving history (in the saved SS file) would reveal that. |
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| jswafa
| | Joined: 25 Mar 2009 | | Posts: 3 | | : | |
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| Posted: Wed Mar 25, 2009 11:44 pm Post subject: Thanks! |
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Thanks very much for the help, AJ & DAJ. I think you're right--I didn't save the puzzle so I can't see what I did for sure, but I restarted it and it worked fine, so at some point I must have inadvertently eliminated 5 from the cell.
I thought maybe I'd come across a bug. Not so fast!! |
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