Bug 385246 - Generated a game that is not solvable without guessing
Summary: Generated a game that is not solvable without guessing
Status: RESOLVED NOT A BUG
Alias: None
Product: ksudoku
Classification: Applications
Component: general (show other bugs)
Version: 1.2.1
Platform: Ubuntu Linux
: VLO minor
Target Milestone: ---
Assignee: Ian Wadham
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-09-30 21:15 UTC by Oliver Kellogg
Modified: 2017-09-30 21:49 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
screenshot of start layout (264.15 KB, image/png)
2017-09-30 21:15 UTC, Oliver Kellogg 		Details
screenshot of point of no continuation (270.22 KB, image/png)
2017-09-30 21:17 UTC, Oliver Kellogg 		Details
same as attachment 108105 saved within ksudoku (1.76 KB, text/xml)
2017-09-30 21:49 UTC, Oliver Kellogg 		Details
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Description Oliver Kellogg 2017-09-30 21:15:34 UTC 
Created attachment 108104 [details]
screenshot of start layout

Ksudoku 3x3 at level "Hard" generated the following start sequence:

 63  8   |
7  2  81 |
852  973 |
       98|
  8   3  |
67       |
 269  583|
 81  2  7|
   8  24 |

I could solve this up to the following layout:

163  8429|
7942  815|
852  9736|
345 2 698|
218 9 374|
679 8 152|
4269  583|
581  2967|
9378  241|

At that point I do not see how to continue.
Comment 1 Oliver Kellogg 2017-09-30 21:17:30 UTC 
Created attachment 108105 [details]
screenshot of point of no continuation
Comment 2 Oliver Kellogg 2017-09-30 21:33:53 UTC 
After consulting http://www.sudokuwiki.org/sudoku.htm, I stand corrected.
The next moves result from "uniqueness in columns":
SINGLE: E4 set to 6, unique in Column
SINGLE: F6 set to 4, unique in Column

Sorry for the noise.
Comment 3 Oliver Kellogg 2017-09-30 21:49:45 UTC 
Created attachment 108106 [details]
same as attachment 108105 [details] saved within ksudoku