Bug 385246

Summary: Generated a game that is not solvable without guessing
Product: [Applications] ksudoku Reporter: Oliver Kellogg <okellogg>
Component: generalAssignee: Ian Wadham <iandw.au>
Status: RESOLVED NOT A BUG    
Severity: minor CC: kde-games-bugs-null
Priority: VLO    
Version First Reported In: 1.2.1   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: screenshot of start layout
screenshot of point of no continuation
same as attachment 108105 saved within ksudoku

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